I used this method and it worked. I only charged the battery up to 13.6V, the voltage then drops down to the normal resting voltage of 12.6V. This method saved me from buying an immediate replacement battery, and a dedicated battery charger, or the possibility of having to call for an emergency jump start service. Thank you for the video.
Brilliant it works, my battery died after I left it in the for 2 months. I charge using this method only light bulb and 19 volt laptop charger. After an hour I start the car with the battery
Thanks, you are a genius. I did the project with 2 light bulbs in parallel. I used it on a battery that was very old and dry as a bone. I filled it up with distilled water and a bit of liquid from another battery. I hooked it all up and it started to charge the battery. At first, the light bulbs didn't go on at all. But as time went on they started to glow a bit and the voltage started to go down from 19v to 17v. The power adapter started to get a little warm as the glowing increased, but not hot. I then swapped the adapter for an actual battery charger and the battery started to charge. Awesome video. Thank you very much.
I've improved the system a bit i've put a powerful headlight lamp and a weak one in parallel, when shorting the + and - both lamp work, but when plugged to my discharged battery only the weak lamp lights up ! Meaning the powerful one will light up when the battery is gonna be charged. Thanks for the tutorial even with electrical knowledge you sometime need a heads-up ! Great channel !
My alternator and battery charger is down and on a small island in the Caribbean there's no replacements due to pandemic. This idea has saved the day and has enabled my 50 year old Land Rover to start, make a trip into town and get me home again. I've taken the ammeter off my defunct battery charger and wired it into the circuit. With a 40W bulb I'm charging at 2.5amps.
This will work without a bulb but you need to charge for short bursts of time eg 5-10mins to avoid overheating the battery. Your 12v battery should take 19v for short periods with rests in between to allow for cooling. Aim to get enough juice into it to get your car started then allow the battery to fully charge on the car with all unnecessary accessories off (eg lights, radio, fans) to avoid straining your alternator. I just charged mine straight (positive to positive etc) from a 19v 3.42amp laptop charger for a total of 35mins over several charges and it started the car no problem. Only issue was the charger itself was making a whining noise so it could be damaged but it was a spare so be aware you could shorten life of your charger or cause it to overheat. Take suitable precautions against acid and explosions, monitor battery and charger, I accept no liability if you follow this advice and are injured or there is damage.
How did I not see this?? I knew there is a way aside from those ludicrously priced battery chargers and then you happened. Thanks so much! Will try it this coming weekend. Been worrying about my battery as I don't have time to go out and have it charged somewhere due to bad weather. Hopefully this can help me solve the problem and hopefully finally let me have a home battery charger! 😍
I like your videos. Here is a comment that I share. All the energy through the light bulb is effectively wasted as heat, probably around 50% of the power from the power pack. Would it be not better to introduce a low cost buck converter ( under $10) to change the 19.5V to 12V, at an efficiency of typically 85-90%? The benefit of the buck converter will be to significantly reduce the emitted heat and charge your battery nearly twice as fast, too.
I have one question. Currenly have laptop charger from premium class notebook. 19.5V and 12A (o think it 230W is ti gona work wih bulk lamo, to dcrease currency?) planning to charge to batter battery is 100ah. One camples , can i dro curenvy wiih potenciomert?
i did same, but my battery charging is below 1volt, so can i do the same to get charged, but bulb connected in series not getting blow and voltage at battery terminal is 19 volt, please help
ok, I've read a lot of your replies so I'm going to assume it's just better to use the 18.5 V or 19 V charger with a light bulb, which gives out about 1.5 amps, that seems to be the best way of doing it. so guess you won't have to answer this if you prefer not to, but thanks for putting this info on you tube. it's great.
Yes, you are correct. Here is one more way to explain why we need a light bulb: a charger and a power supply actually are two different devices. A battery charger limits current, but a power supply doesn't limit current at all, and that is why we need a light bulb. Moreover, in order to fully charge a battery, we'll need to reach 14.2V on its terminals, which is impossible using a 13.5V power supply. Anyways I am glad that you find my video useful.
Hello, I have a 19V laptop power supply and a 21W bulb, I have been charging the battery during all the day but the battery between its poles does not pass above 12.30V. Any suggestion?
Dear this will work on bike battery?? I tried it but bulb didn't turn on,so that is why now change in the volts, stays at 19v. Why the bulb is not turning on??
How u increased charging current? I mean u said by adding load..?but do current flow be effected by adding load? U kept 12V bulb & droped ,doesn't the overall voltage is Lesss than the charging voltage range like 14V to 15V
Did you try it without the light bulb? I ask, because a lithium battery charger should be designed to work in constant current mode until it's constant voltage point is reached. Then you would have an even simpler system and it would be more efficient.
Hi, there are a lot of ways to improve this system, it would be great to charge it with "constant current mode until it's constant voltage point is reached" but then the circuit will be much more complicated. Also, the light bulb is wasting a lot of energy... energy efficient charger should use PWM... BUT: The point of my video is to make a very simple charger using just components that most people have. It is "emergency DIY car battery charger", and it should be used in case you really need to charge the battery and you don't have a regular charger.
Because 'Laptop charger' is 19V and it is going to try to charge the battery to 19V immediately, and that will cause a very high current, which will trigger overcurrent protection. The lightbulb limits the charging current. Btw, 'Laptop charger' is not a charger, it is a power supply (or power adapter). The actual circuit that controls charging of a laptop is inside the laptop. P.S. Ok, right after you said "work in constant current mode until it's constant voltage point is reached" I started to think that you know all this well, and that you do not ask a simple question about the lightbulb. Got it now, sorry :)
Ha ha, no problem. Maybe other people were thinking the same as me? I didn't know that the laptop contained the charging circuitry, but that makes sense since the laptop should operate even if the battery is flat when the power unit is connected. btw. I realised that I had a power tool Ni-cad charger that works OK as a directly-connected charger to my car battery, it outputs 2.6A from zero volts up, with a 30 volt open circuit voltage. I have some DVMs to monitor the VA
That's great. I have a query: When I test voltage on CHARGING mode, it shows 14.2v, and when switched off the CHARGING, it shows battery voltage 12.x volts not 14.2v now. Here you have said to keep the charging till 14.2v battery voltage - Now this voltage you have said is while CHARGING or CHARGING disconnected? There's a difference of about 14.2v - 12.6v=1.6v when charging is off. Obviously on charging it shows 1.6v more than actually battery voltage. I am using 12v 21w bulb and 65W laptop charger with output of 1.xAmp
Hi, 14.2v is while charging (charger connected). When it reaches 14.2v while charging you can consider it fully charged, and you can disconnect the charger. Usually, it slowly drops to 13.0V, but I think 12.6V is fine.
@@ElectricalPro Thanks. I got it. I think 12.70v is default we get newly from market. so 12.6v is fine. But finally it dropped to 12.3v which shows the battery is holding 50-70 charge.
@@ElectricalPro Thanks once again for your response. Yeah I also think that all cells are not charged equally but I had to close the charging as it was reached to 14.6v and battery was showing 12.8v means it was reached to full charging level. But as voltage is dropped from 12.8 to 12.3v I believe it is no more holding the charging equally to all the cells. But it's running fine on 12.3 also and my car run daily so let's see how far the battery goes.
if you have a modern battery you'll need a special a special desulfatation charger (it does high freq higher voltage (30-40v) cycles to make the electrodes to vibrrate and unclog 'em) to bring it back to life and it may cost more than the price of a new battery. they use 'em in specialised centers where it's economically justified to do it on dozens of batteries. DIY it'd be complicated... and it'd take like 2-3 days...
@@andreika6681 but modern batteries when it discharge it for too long the positive plates get worn out got broken sometimes i charged my batteries with desulfator
I have a question: I replaced a car battery recently as it was 3 years old and could not start the engine. I checked the voltage using a multimeter and it showed 10.45 Volts. Does it mean the battery is quite dead and cannot be charged?
Just try to charge it, 10.45 Volts just means it is discharged. If it is a new battery just from a store it is not good, because storing discharged battery is bad for the battery.
Hi there! Tried the same technique but for some reason, the bulb does not light up in this particular circuit. When I connect the bulb separately in power socket it lights up and when the same thing is connected to the circuit, nothing happens. Any advice on what I might be doing wrong?!
maybe because the voltage go thru the bulb 7v so not enough, or +ve side of bulb must connect with +ve side of charger and -ve side of bulb connect with +ve side of battery due to current flow.
Hi there. I have the suply of 19v 3.72amps laptop charger ..and I used a dual wire bulb with a wattage of 5Watt 12V and What is the thickness that the wire must be or is it okey if the wire stays cool cause I have a 0.5mm wire for the stream
Hi, If you use 5 Watt 12V bulb then the charging current will be less than 0.5A, I think your 0.5mm wire will handle such current fine, but a thicker wire is better of course. Thicker wire can handle much more current. The thicker wire you use the cooler it will be.
What shoult be the battery voltage without charging and with charging when its fully charged mine is a 12 v car battery showing 14.2 v when charging and 12.2 v when charger is removed also the charging amp is decreased to 2.8 amps
Hi, the voltage without charging will depend on how charged the battery is. 12.6V-13V I consider the battery is charged. 12V I consider the battery pretty discharged. 10.5V-11V means the battery deeply discharged. Below 10.5V is very bad for the battery, you need to charge it as soon as possible. (better google it, it may be not 100% accurate). When I disconnect the charger it drops from 14.2V to 13V pretty quickly, then slowly to 12.6V... so your 12.2V looks a little low to me. Suggestion: Try to charge it to 14.4V-14.6V (maybe even 15V) with open cells, it is called "Equalizing Charge". Maybe your cells charged not equally and that it why you have 12.2V.
@@luizmagalhaesbr Hello.. sorry it's been a while, may I know how did you calculate the amps? Let's say Vx is the voltage of the laptop charger, and Ax is the amps of laptop charger, what's the formula to calculate the needed external amps? Thank you
There is a trick to install correct circuit ,when light blub On >> Connector of laptop has two sides Negative (one contact )positive (two contacts + and sens ,if you keep connector ) ,should wire bulb touch both contact positive of connector.
What did you mean by "sens"? My connection bulb (which was connected to my laptop charger position on one hand and to battery positive terminal) switch on (though low voltage) only when it wire makes contact with the negative in the laptop charger mouth.
HI, i just watch your video, i have a set of battery for my ebike 48v20Ah, when its full charge it will be 52 to 53v on my lcd, but lately, i charge it then my charger gets green, when i check my lcd its still the same but when i run my ebike, it just fall fast unto 42.7v that causes my ebike to crawl. when i check the batterys individualy (12v each set of 4) one of the batterys line just got burned due to the wire was jam. so im asking if i can do these procedure like on your video to fully charge my batterys? hope youl read my comment and help me thank you....
I think you can use a potentiometer instead of a light bulb and check the voltage with a meter. Am I right? And can I charge the batteries eg 3V or 6V with this power supply?
Hi, yes, but you'll need a very powerful potentiometer. Depending on a desired current you will need a 10W or maybe even 60W potentiometer. For a 6V motorcycle battery I think it is better to use a 12V power supply, it will be more energy efficient. But please DON'T charge Li-ion batteries with this method, because they may explode.
If you need higher charging current, then you need to connect more powerful bulb. (and if you want you can connect bulbs in parallel or sequentially, in order to get desirable current). But charging current shouldn't be higher than your power supply can provide.
I don't need to charge a battery i want something that can power up my 2 car amplifiers that i got in my room I'm using a power supply from a desktop computer but its too weak its rated 20 ampa at 12 volts so i need like 14.4 volts an about 40 to 60 amps of current
I think it should work fine with 12V and it is not necessary to have 14.4V. I think you need to buy a powerful desktop PC power supply, but 60A! omg, it is probably very expensive.
Hi, my laptop charger can provide 3.16 Amps (max). Yes the light bulb limits current to 1.2A - 1.8A, but if you use more powerful light bulb the current will be higher.
Hi, yes, the bulb needs to light when charging, and the brightness of the light will become lower and lower throughout the charging. Charging time will depend on many things, like the capacity of the battery, and how deeply it is discharged, and also light bulb effects charging time, a more powerful bulb will make charging faster. The best way to tell whether the battery is fully charged or not is to measure the voltage while the battery is charging. If the voltage becomes higher than 14.2V the battery is fully charged.
Hi, I think nothing will happen even if you overcharge it. For example in a car when engine working the battery is charging with closer cells (ports?) and everything is fine. From Wikipedia: "if the pressure exceeds safety limits, safety valves open to allow the excess gases to escape" en.wikipedia.org/wiki/VRLA_battery But I still recommend controlling voltage of the battery while charging. And charging with the correct current is also important. (if a battery has for example 12Ah capacity it means that the charging current should not be higher than 1.2A).
It is only possible if you use voltage booster. For example you can boost voltage from 24V to about 36V-42V and then charge 36V battery, also your charging circuit (voltage booster) needs to limit charging current. Limiting charging current can be done with a light bulb just like in the video, but you will waste a lot of energy... Better to get a voltage booster that can limit current. Without increasing voltage it is not possible.
Yes, it limits the charging current. Without a light bulb the charging current will be higher than your power supply can provide, and it will trigger over-current protection, the worst case scenario it will damage the power supply.
Help me! So the laptop charger can charge batteries directly!? I have three 6 volt batteries that I will connect them series to produce 18 volts, that laptop charger which is about 18 volt itself will charge them from end-to-end correct? Also if I added 1/4 battery to get 24 volts will the charger be sufficient and work properly? Thanks
To fully charge a 12V battery you'll need 14.2V, therefore for a 6V battery, you will need 7.1V, but since you have 3 of them connected sequentially you will need 21.3V for a full charge. So 19V Power supply will not be enough. Moreover, to charge a battery you will need some kind of current limiter, in the video, I've used a light bulb for such purpose.
Ingenious way of using existing hardware 2 solve y'r problem, BTW.. my damn laptop charger (TUM-90WAUT) (9.5-22V; 5A max outp.((90W)), shouldn't need this, should by its own downrate itself, but only after adding the serial resistor of the lamp switches to 12 Volts, ripping my hair out.. any idea?
Hi, unfortunately, 12V is not enough, because a fully charged battery has 14.2V, so with just 12V you will never be able to charge a battery to 14.2V... that is why I've used a 19V adapter in the video.
Hi, you mean that if i use two bulbs the charging will become faster because it will also double the amphere , or let me say 1 bulb is to 2 amp and 2 bulb become 4 amp, i am right?
Yes, you are right. Small clarification: it will double the current when you connect the bulbs in parallel.... but if you connect bulbs in the sequence you will decrease the charging current in half instead of doubling it.
Hi, Unfortunately, you cannot just connect your 12V adaptor and charge your car battery, and here's why: to fully charge a 12-volt battery your adaptor should provide about 14.2 Volts, but it is not all, also your adapter should limit charging current to about 4 Amperes (in the video I've used a light bulb in order to do that).
Hi, Similar questions were asked many times previously. The simple answer is: You CANNOT charge a battery without a light bulb because you will kill your power supply.
Excess voltage cut the life spam of the battery or disfigure the sharp of the battery. Best voltage to charge 12v battery is 13.8. For fast charging depending on the ah.
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I used this method and it worked. I only charged the battery up to 13.6V, the voltage then drops down to the normal resting voltage of 12.6V. This method saved me from buying an immediate replacement battery, and a dedicated battery charger, or the possibility of having to call for an emergency jump start service. Thank you for the video.
Brilliant it works, my battery died after I left it in the for 2 months. I charge using this method only light bulb and 19 volt laptop charger. After an hour I start the car with the battery
Thanks, you are a genius.
I did the project with 2 light bulbs in parallel.
I used it on a battery that was very old and dry as a bone.
I filled it up with distilled water and a bit of liquid from another battery.
I hooked it all up and it started to charge the battery.
At first, the light bulbs didn't go on at all.
But as time went on they started to glow a bit and the voltage started to go down from 19v to 17v.
The power adapter started to get a little warm as the glowing increased, but not hot.
I then swapped the adapter for an actual battery charger and the battery started to charge.
Awesome video.
Thank you very much.
5yrs ago na video mo tol pero sobrang sulit at nashare mo d2, so helpful
I've improved the system a bit i've put a powerful headlight lamp and a weak one in parallel, when shorting the + and - both lamp work, but when plugged to my discharged battery only the weak lamp lights up ! Meaning the powerful one will light up when the battery is gonna be charged. Thanks for the tutorial even with electrical knowledge you sometime need a heads-up ! Great channel !
what wattage did you used for each lamp?
My alternator and battery charger is down and on a small island in the Caribbean there's no replacements due to pandemic. This idea has saved the day and has enabled my 50 year old Land Rover to start, make a trip into town and get me home again. I've taken the ammeter off my defunct battery charger and wired it into the circuit. With a 40W bulb I'm charging at 2.5amps.
قصتك جميلة في البحر الكاريبي ....تمتع
What would happen without the bulb?
I would like to know what what would happen if you don't use the bulb
Yea what would happen with out the bulb and cant u just use the loptop charger to just start the car
the buld reduce the adapter output from 19v to 12v
I believe there'd be a risk of damaging the battery and producing dangerous fumes. At worst, it may explode or leak acid. But that'd be extreme.
This will work without a bulb but you need to charge for short bursts of time eg 5-10mins to avoid overheating the battery. Your 12v battery should take 19v for short periods with rests in between to allow for cooling. Aim to get enough juice into it to get your car started then allow the battery to fully charge on the car with all unnecessary accessories off (eg lights, radio, fans) to avoid straining your alternator. I just charged mine straight (positive to positive etc) from a 19v 3.42amp laptop charger for a total of 35mins over several charges and it started the car no problem. Only issue was the charger itself was making a whining noise so it could be damaged but it was a spare so be aware you could shorten life of your charger or cause it to overheat. Take suitable precautions against acid and explosions, monitor battery and charger, I accept no liability if you follow this advice and are injured or there is damage.
This Technic,just saved my butt ..that's a lot ..it really works
Impressive, using bulb as a resistor,. Brilliant
Can i connect two 6V bulbs in series to get the resistance of 12 V bulb
Yea
Thank you very much. Greetings from Venezuela.
Oh my god its work! i use asus laptop adaptor and 12 volt 35watt bulb♥️♥️♥️♥️ very thx,, my car finaly start again,
How did I not see this?? I knew there is a way aside from those ludicrously priced battery chargers and then you happened. Thanks so much! Will try it this coming weekend. Been worrying about my battery as I don't have time to go out and have it charged somewhere due to bad weather. Hopefully this can help me solve the problem and hopefully finally let me have a home battery charger! 😍
Does it work or will it affect the battery or the charger?
So, what to do with the negative wire, my lights won't light up unless i connect a negative to it
why use lamp? for reduce voltage or amper?
if i have 19v adaptor with 0.5 amper do i nedd lamp? thanks
From now on, m saving a lot of time, money and energy!
Now I have one engineering degree!! 😎😎
I like your videos. Here is a comment that I share.
All the energy through the light bulb is effectively wasted as heat, probably around 50% of the power from the power pack. Would it be not better to introduce a low cost buck converter ( under $10) to change the 19.5V to 12V, at an efficiency of typically 85-90%? The benefit of the buck converter will be to significantly reduce the emitted heat and charge your battery nearly twice as fast, too.
Wattage of that 12V light bulb please
I have one question. Currenly have laptop charger from premium class notebook. 19.5V and 12A (o think it 230W is ti gona work wih bulk lamo, to dcrease currency?) planning to charge to batter battery is 100ah. One camples , can i dro curenvy wiih potenciomert?
i did same, but my battery charging is below 1volt, so can i do the same to get charged, but bulb connected in series not getting blow and voltage at battery terminal is 19 volt, please help
Why did you leave the cell caps open while charging?
ok, I've read a lot of your replies so I'm going to assume it's just better to use the 18.5 V or 19 V charger with a light bulb, which gives out about 1.5 amps, that seems to be the best way of doing it. so guess you won't have to answer this if you prefer not to, but thanks for putting this info on you tube. it's great.
Yes, you are correct.
Here is one more way to explain why we need a light bulb: a charger and a power supply actually are two different devices. A battery charger limits current, but a power supply doesn't limit current at all, and that is why we need a light bulb. Moreover, in order to fully charge a battery, we'll need to reach 14.2V on its terminals, which is impossible using a 13.5V power supply. Anyways I am glad that you find my video useful.
Every battery car or some special batteries with open /close cells ?
Would a LED diode work instead of a light bulb? i have a bunch
Sorry. I am a novice. Can I use this method for a sealed battery without lids? How do I know when the battery is fully charged? Thanks.
Hello, I have a 19V laptop power supply and a 21W bulb, I have been charging the battery during all the day but the battery between its poles does not pass above 12.30V. Any suggestion?
battery is probably damaged.
Awesome Sir! BEst Regards from GOLDEN WORKS TV.
Sir can i ask..what bulb you usef at your video? I mean what is that watts your bulb you use??
I'm confusing your connection from bulb to battery(output of bulb), please
Dear this will work on bike battery?? I tried it but bulb didn't turn on,so that is why now change in the volts, stays at 19v. Why the bulb is not turning on??
can we simply use a 35 ohms resistance instead of bulbs
i all ready try this, but when i connect it to tha battery the bulb light up even though the charger is nor plug in. is rhat ok?
Hi.how will I know if my car battery if fully charge...I don't have volt meter or tester...
what if I use a 12 volt wifi adapter? can it charge my battery?
Do i need bulb if my charger is 14:4 volt
Can i use a 21 Watt 12volt car lamp bulb?
have the following: 15v 3a charger with battery voltage currently at about 12v ... what is the 12v light bulb wattage range to use? thanks
You do not use a bulb, conectalo directo.
Great man.. is it necessary to add bulb in series
tamamda lamba nasıl yanıyor eksi olmadan?
Can I use a 120W laptop charger ?
So if i had 14v laptop charger i wouldnt need a light bulb would i?
I have a question: do you need to plug in the battery?
I have 12v 5 a charger. Can i contact it directly to battery without bulb please reply
I have same materials even 19v 3amp supply but with mine i still havw 19 volt after bulb
Hi can i use 12v led? I don't have a bulb
Can I use 24v ? And do it like that to charge my car battery ?
Can I jump start with this?
How u increased charging current? I mean u said by adding load..?but do current flow be effected by adding load? U kept 12V bulb & droped ,doesn't the overall voltage is Lesss than the charging voltage range like 14V to 15V
Sir,,what is the watts of bulb i use,??
Did you try it without the light bulb? I ask, because a lithium battery charger should be designed to work in constant current mode until it's constant voltage point is reached. Then you would have an even simpler system and it would be more efficient.
Hi, there are a lot of ways to improve this system, it would be great to charge it with "constant current mode until it's constant voltage point is reached" but then the circuit will be much more complicated. Also, the light bulb is wasting a lot of energy... energy efficient charger should use PWM... BUT: The point of my video is to make a very simple charger using just components that most people have. It is "emergency DIY car battery charger", and it should be used in case you really need to charge the battery and you don't have a regular charger.
Thanks for your reply. But what I meant is: why not connect the Laptop charger directly to the car battery?
Because 'Laptop charger' is 19V and it is going to try to charge the battery to 19V immediately, and that will cause a very high current, which will trigger overcurrent protection. The lightbulb limits the charging current. Btw, 'Laptop charger' is not a charger, it is a power supply (or power adapter). The actual circuit that controls charging of a laptop is inside the laptop.
P.S. Ok, right after you said "work in constant current mode until it's constant voltage point is reached" I started to think that you know all this well, and that you do not ask a simple question about the lightbulb. Got it now, sorry :)
Ha ha, no problem. Maybe other people were thinking the same as me? I didn't know that the laptop contained the charging circuitry, but that makes sense since the laptop should operate even if the battery is flat when the power unit is connected. btw. I realised that I had a power tool Ni-cad charger that works OK as a directly-connected charger to my car battery, it outputs 2.6A from zero volts up, with a 30 volt open circuit voltage. I have some DVMs to monitor the VA
@@AndyWJP what about an other kind of power source other than a laptop. Perhaps a mobile phone or something with 14.4v output
can i use output 20v?
Oh my battery is charging 🙏💕 thank you so much I sub
Please help, my charger have 3 wires, (White, black, blue)
What is the purpose of the bulb?
can I use a 13.5 computer charger rated at 3.5 amps, without putting in the bulb???
your computer charger will be damaged bruh
Got a link to the digital volt meter … that’s cool
What happens if I put the 19v laptop charger directly for about 10 minute's
That's great. I have a query:
When I test voltage on CHARGING mode, it shows 14.2v, and when switched off the CHARGING, it shows battery voltage 12.x volts not 14.2v now. Here you have said to keep the charging till 14.2v battery voltage - Now this voltage you have said is while CHARGING or CHARGING disconnected?
There's a difference of about 14.2v - 12.6v=1.6v when charging is off. Obviously on charging it shows 1.6v more than actually battery voltage. I am using 12v 21w bulb and 65W laptop charger with output of 1.xAmp
Hi, 14.2v is while charging (charger connected). When it reaches 14.2v while charging you can consider it fully charged, and you can disconnect the charger. Usually, it slowly drops to 13.0V, but I think 12.6V is fine.
@@ElectricalPro Thanks. I got it. I think 12.70v is default we get newly from market. so 12.6v is fine. But finally it dropped to 12.3v which shows the battery is holding 50-70 charge.
Maybe not all of the cells are equally charged. Maybe "equalizing charge" is needed, but I am not sure.
@@ElectricalPro Thanks once again for your response. Yeah I also think that all cells are not charged equally but I had to close the charging as it was reached to 14.6v and battery was showing 12.8v means it was reached to full charging level. But as voltage is dropped from 12.8 to 12.3v I believe it is no more holding the charging equally to all the cells. But it's running fine on 12.3 also and my car run daily so let's see how far the battery goes.
I have 19.5 volt and 7.7amp adaptor. so i will use 12 volt 35watt bulb use this adaptor. Plz plz answer me.
Üdv honan tudom hogy az akumlátor feltöltödöt???
Hi @Electrical projects,
i have 19.5v charger and 12v 35w bulb. Can I use it to charge a 65A battery. Battery is currently having only 8v showing.
Your battery must be broken. To old.sulfated cell.or dried up cell
if you have a modern battery you'll need a special a special desulfatation charger (it does high freq higher voltage (30-40v) cycles to make the electrodes to vibrrate and unclog 'em) to bring it back to life and it may cost more than the price of a new battery. they use 'em in specialised centers where it's economically justified to do it on dozens of batteries. DIY it'd be complicated... and it'd take like 2-3 days...
@@andreika6681 but modern batteries when it discharge it for too long the positive plates get worn out got broken sometimes i charged my batteries with desulfator
How much time.it will.take to charge 50 amp.battery
I have a question: I replaced a car battery recently as it was 3 years old and could not start the engine. I checked the voltage using a multimeter and it showed 10.45 Volts. Does it mean the battery is quite dead and cannot be charged?
Just try to charge it, 10.45 Volts just means it is discharged. If it is a new battery just from a store it is not good, because storing discharged battery is bad for the battery.
Hi...can i use 100 watt bulb??
Hi there! Tried the same technique but for some reason, the bulb does not light up in this particular circuit. When I connect the bulb separately in power socket it lights up and when the same thing is connected to the circuit, nothing happens. Any advice on what I might be doing wrong?!
You have to connect the light bulb only to the positive side of the battery and the other end must be connected to the charger in series
maybe because the voltage go thru the bulb 7v so not enough, or +ve side of bulb must connect with +ve side of charger and -ve side of bulb connect with +ve side of battery due to current flow.
Hi bro, can I charge 12v maintenance free battery of my bike with this method ? Thanks.
Thank you very much, it works very well. I'm from Brazil !
If I don't have the right light bulb, can I use resistors in series?
Hi, yes you can, but you will need a lot of resistors to make 6W or even 12W in total.
Hi there. I have the suply of 19v 3.72amps laptop charger ..and I used a dual wire bulb with a wattage of 5Watt 12V and What is the thickness that the wire must be or is it okey if the wire stays cool cause I have a 0.5mm wire for the stream
And I dont have the multimeter so I dont know if my charging current is enough can you please reply a.s.a.p
Hi, If you use 5 Watt 12V bulb then the charging current will be less than 0.5A, I think your 0.5mm wire will handle such current fine, but a thicker wire is better of course. Thicker wire can handle much more current. The thicker wire you use the cooler it will be.
Непогано. Але вони кажуть "negative" та "positive", це в нас тільки плюс та мінус. Що plazma - ще жива чи нє? В мене A-Mega 7 Ultra 2016 ще жива.
What shoult be the battery voltage without charging and with charging when its fully charged mine is a 12 v car battery showing 14.2 v when charging and 12.2 v when charger is removed also the charging amp is decreased to 2.8 amps
Hi, the voltage without charging will depend on how charged the battery is. 12.6V-13V I consider the battery is charged. 12V I consider the battery pretty discharged. 10.5V-11V means the battery deeply discharged. Below 10.5V is very bad for the battery, you need to charge it as soon as possible. (better google it, it may be not 100% accurate).
When I disconnect the charger it drops from 14.2V to 13V pretty quickly, then slowly to 12.6V... so your 12.2V looks a little low to me.
Suggestion: Try to charge it to 14.4V-14.6V (maybe even 15V) with open cells, it is called "Equalizing Charge". Maybe your cells charged not equally and that it why you have 12.2V.
@@ElectricalPro 👍
@@ElectricalPro Thanks my car started 😀
Can I use cpu fan instead of ligth bulb ?
Yes, I think you can use a 12V fan instead of the bulb, but the charging current probably will be very low.
Electrical Projects [Creative Lab] ah ok thanks man new subb here sub me back from Philippines my battery is charging
Yes, you can. I tried a 5w lamp but the amp was a little high, then instead I used 3 CPU fans, with 0.4 ah in total, the value that I was looking for.
@@luizmagalhaesbr Hello.. sorry it's been a while, may I know how did you calculate the amps?
Let's say Vx is the voltage of the laptop charger, and Ax is the amps of laptop charger, what's the formula to calculate the needed external amps?
Thank you
There is a trick to install correct circuit ,when light blub On >> Connector of laptop has two sides Negative (one contact )positive (two contacts + and sens ,if you keep connector ) ,should wire bulb touch both contact positive of connector.
What did you mean by "sens"?
My connection bulb (which was connected to my laptop charger position on one hand and to battery positive terminal) switch on (though low voltage) only when it wire makes contact with the negative in the laptop charger mouth.
هل يمكن استخدام لمبة 21/5
HI, i just watch your video,
i have a set of battery for my ebike 48v20Ah, when its full charge it will be 52 to 53v on my lcd, but lately,
i charge it then my charger gets green, when i check my lcd its still the same but when i run my ebike, it just fall fast unto 42.7v that causes my ebike to crawl. when i check the batterys individualy (12v each set of 4) one of the batterys line just got burned due to the wire was jam.
so im asking if i can do these procedure like on your video to fully charge my batterys?
hope youl read my comment and help me
thank you....
Thank you very much more diy videos to come..,..
I think you can use a potentiometer instead of a light bulb and check the voltage with a meter. Am I right?
And can I charge the batteries eg 3V or 6V with this power supply?
Hi, yes, but you'll need a very powerful potentiometer. Depending on a desired current you will need a 10W or maybe even 60W potentiometer. For a 6V motorcycle battery I think it is better to use a 12V power supply, it will be more energy efficient.
But please DON'T charge Li-ion batteries with this method, because they may explode.
Sir I connect properly but bulb power is going to decrease, solution please sir
if i Used 4 Bulbs Is it going be dangerous
Adaptör gücü kaç olmalı en az ?
60 A aküyü kaç saat şarj etmek gerekir bu şekilde ?
Very Good from Brazil
hey if i need to get more amps out of the charger what can i do
If you need higher charging current, then you need to connect more powerful bulb. (and if you want you can connect bulbs in parallel or sequentially, in order to get desirable current). But charging current shouldn't be higher than your power supply can provide.
I don't need to charge a battery i want something that can power up my 2 car amplifiers that i got in my room I'm using a power supply from a desktop computer but its too weak its rated 20 ampa at 12 volts so i need like 14.4 volts an about 40 to 60 amps of current
I think it should work fine with 12V and it is not necessary to have 14.4V. I think you need to buy a powerful desktop PC power supply, but 60A! omg, it is probably very expensive.
How many amps is your laptop charger??? And when you connect the light bulb it reduces amps as well???
Hi, my laptop charger can provide 3.16 Amps (max). Yes the light bulb limits current to 1.2A - 1.8A, but if you use more powerful light bulb the current will be higher.
does the bulb need to light when chargeing and how long is it going to stay to charge fully
Hi, yes, the bulb needs to light when charging, and the brightness of the light will become lower and lower throughout the charging. Charging time will depend on many things, like the capacity of the battery, and how deeply it is discharged, and also light bulb effects charging time, a more powerful bulb will make charging faster.
The best way to tell whether the battery is fully charged or not is to measure the voltage while the battery is charging. If the voltage becomes higher than 14.2V the battery is fully charged.
What if its a low maintenance battry and no ports to b opened during charging
Hi, I think nothing will happen even if you overcharge it.
For example in a car when engine working the battery is charging with closer cells (ports?) and everything is fine.
From Wikipedia: "if the pressure exceeds safety limits, safety valves open to allow the excess gases to escape"
en.wikipedia.org/wiki/VRLA_battery
But I still recommend controlling voltage of the battery while charging. And charging with the correct current is also important. (if a battery has for example 12Ah capacity it means that the charging current should not be higher than 1.2A).
how can i charge a 12V battery with a 19V charger and why does the lamp turn off when the battery is fully charged
Yes, I saw on someone's video when the battery is fully charged the lamp turns off.
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Is it possible to charge a 36 volt battery with a 24 volt battery
It is only possible if you use voltage booster. For example you can boost voltage from 24V to about 36V-42V and then charge 36V battery, also your charging circuit (voltage booster) needs to limit charging current. Limiting charging current can be done with a light bulb just like in the video, but you will waste a lot of energy... Better to get a voltage booster that can limit current. Without increasing voltage it is not possible.
Bulb is necessary???
Yes, it limits the charging current. Without a light bulb the charging current will be higher than your power supply can provide, and it will trigger over-current protection, the worst case scenario it will damage the power supply.
Help me! So the laptop charger can charge batteries directly!? I have three 6 volt batteries that I will connect them series to produce 18 volts, that laptop charger which is about 18 volt itself will charge them from end-to-end correct? Also if I added 1/4 battery to get 24 volts will the charger be sufficient and work properly? Thanks
To fully charge a 12V battery you'll need 14.2V, therefore for a 6V battery, you will need 7.1V, but since you have 3 of them connected sequentially you will need 21.3V for a full charge. So 19V Power supply will not be enough. Moreover, to charge a battery you will need some kind of current limiter, in the video, I've used a light bulb for such purpose.
Ingenious way of using existing hardware 2 solve y'r problem, BTW.. my damn laptop charger (TUM-90WAUT) (9.5-22V; 5A max outp.((90W)), shouldn't need this, should by its own downrate itself, but only after adding the serial resistor of the lamp switches to 12 Volts, ripping my hair out.. any idea?
But the bulb will not stop the battery voltage on ~13v !
HI i have a AC adaper that OUTPUT:12VDC --4.0A can i use this as a car charger and how? Tnx
Hi, unfortunately, 12V is not enough, because a fully charged battery has 14.2V, so with just 12V you will never be able to charge a battery to 14.2V... that is why I've used a 19V adapter in the video.
Hi, no, 12V is not enough to charge 12V battery, that is why I've used 19V. (sorry for the late answer).
My light doesnt glow.
Hi, you mean that if i use two bulbs the charging will become faster because it will also double the amphere , or let me say 1 bulb is to 2 amp and 2 bulb become 4 amp, i am right?
Yes, you are right. Small clarification: it will double the current when you connect the bulbs in parallel.... but if you connect bulbs in the sequence you will decrease the charging current in half instead of doubling it.
Why my bulb goes on and off
it is ok because the charger gives ac current
i have a 12v adaptor can i use it to charge our car battery?
Hi, Unfortunately, you cannot just connect your 12V adaptor and charge your car battery, and here's why: to fully charge a 12-volt battery your adaptor should provide about 14.2 Volts, but it is not all, also your adapter should limit charging current to about 4 Amperes (in the video I've used a light bulb in order to do that).
how long it will takes to charge a battery of a motor and battery of a car if I use your method?
hi...wat happens when i don t put a bulb......19v dc 4 amp whll charging 12v powder battery
Hi, Similar questions were asked many times previously. The simple answer is: You CANNOT charge a battery without a light bulb because you will kill your power supply.
Julius Sekadde ksk
Excess voltage cut the life spam of the battery or disfigure the sharp of the battery. Best voltage to charge 12v battery is 13.8. For fast charging depending on the ah.
this guy sounded like a Tesla Tank in Red Alert 2 - Yuris Revenge XD
cool game butt not cool🖕🏻 thats my brother
hi luis is that the same thing you did last time