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  • Опубліковано 21 січ 2025

КОМЕНТАРІ • 406

  • @TechnocraticBushman
    @TechnocraticBushman 8 років тому +37

    Says short video, keeps it a little under 14 minutes. Says he's not doing an tutorial channel and manages to be a top resource to go to. Pure gold! You can almost get 20 years worth of EE experience just by listening to Dave going into all the little minutia. You can actually get a "feel" for this stuff and feel confident enough to do build your own charging circuit just by watching this video.

  • @EEVblog
    @EEVblog  8 років тому +122

    Sorry for the re-uploads, I wanted to remove most of the the voltage drop stuff to avoid confusion and constant emails and messages and comments for the next 5 years.

    • @JustinAlexanderBell
      @JustinAlexanderBell 8 років тому +4

      What was the problem?

    • @sokolum
      @sokolum 8 років тому

      🖒

    • @Hasitier
      @Hasitier 8 років тому +1

      And i thought youtube does not like your videos anymore ;-)

    • @sokolum
      @sokolum 8 років тому +3

      +Fermioncool Fermioncool I assume the voltage drop could be seen as a extra security, at the batteries emd you will never go beyond 4.2, again I assume.

    • @SadeXo1
      @SadeXo1 8 років тому +3

      Dave, maybe this is a small video, but the topic is very popular in recent times, and every mistake can be noticed and stigmatized that it is not repeated.

  • @ianhosier4042
    @ianhosier4042 2 роки тому +9

    I have been charging 18650 cells on my lab supply for years. Set the current to 1A and the voltage to 4.2v per cell. Stop charging once the current is reduced to 100mA. Sometimes I charge overnight with a current limit of 250mA and again stop the charge when the current reaches 100mA. I have started experimenting with TP4056 modules which automatically stop the charge which is quite handy for unattended charging.

  • @jenelmarian9946
    @jenelmarian9946 Рік тому +218

    Making use of the ua-cam.com/users/postUgkxcJ22tnHH9l1vjdIdEIG27iOG55P7LXI8 reconditioning plan, I just saved 2 auto batteries from being completely junked. The guides were very simple to follow. I wish I would have found this years ago! You may use the guide to recondition any battery type

  • @backpropagated
    @backpropagated 5 років тому +3

    Thank you! I spent $400 on a drone, and didn't buy a lipo charger because I thought I had one. This will get me buy until Amazon gets one to me!

  • @kaizen9451
    @kaizen9451 8 років тому +5

    I liked how you repeated certain parts of the video Dave. Like when discussing the graph. This is really really helpful for people like me who struggle to learn these ideas.

  • @robertvaldimarsson2109
    @robertvaldimarsson2109 8 років тому +25

    Rigol actually has an app note, warning you not to hook up batteries, without at least a diode as protection, since the DP832's inputs are apparently very sensitive to being fed with voltage or current.

    • @stargazer7644
      @stargazer7644 8 років тому

      Thanks, I was looking for that. I was sure Dave mentioned this in a previous video. He must have forgotten.

  • @bradleymorgan8223
    @bradleymorgan8223 3 роки тому +3

    It's been mentioned, but military tech only charges lithium batteries to 3.9v. Maybe 80% of the capacity, but close to 5 times more charge cycles.

    • @live4491
      @live4491 2 роки тому +1

      Yes, at a "storing" voltage... exactly right

  • @gionnic8922
    @gionnic8922 4 роки тому +5

    Nice video! Thanks!!
    Any chance you could do a follow up or give a base explanation of how to charge a Lithium ion pack with cells in series and parallel?

  • @kmonyt
    @kmonyt 8 років тому +14

    Nice video. I've got a Rigol DP832, no doubt because you've shown/reviewed/talked about it here. A video showing how to use some of the advanced features would be useful to me! Many of these devices are similar....the concepts would transfer to other makes and models...

  • @bilaloz4319
    @bilaloz4319 8 років тому +8

    Also do a how to safely discharge video please, cheers !

  • @tohopes
    @tohopes 8 років тому +19

    You could put your power supply on a cheap outlet shut-off timer if you didn't have a fancy expensive power supply.
    3:20 I'm commenting on that 3.5-inch digital multimeter again.
    Watch out for that first step, it's a doozy.

    • @shiftyjesusfish
      @shiftyjesusfish 3 роки тому

      Thanks for the idea, 100% gunna use that one

  • @alextrofimov7947
    @alextrofimov7947 8 років тому +1

    It's so simple, but I've never thought about it! Thanks)

  • @ab_ab_c
    @ab_ab_c 8 років тому +7

    The safe max charging V for that Panasonic cell = 4.25V
    The recommended charge cut-off A = 65mA (which is 0.02C, not 10% of the CC).
    Thanks for sharing.
    p.s.: If you want to get max cycle life out of the cell, it is recommended to charge it to a max V of 4.1V & not discharge it more than 20% when using it. >= 50% DOD really creates a significantly shortened cell life.

    • @OrbitalSP2
      @OrbitalSP2 8 років тому

      A B Buying a cell to discharge it no more than 20%....no thanks.

    • @ab_ab_c
      @ab_ab_c 8 років тому +3

      OrbitalSP2:
      Well, your power needs may be quite different than someone who wants optimal cell life--which is fine--you'll just consume more cells & pay more $ for your power needs than a person seeks optimal cell life.

    • @OrbitalSP2
      @OrbitalSP2 8 років тому

      A B I know what you say is true. But i just avoid discharging more than 80%. I mean discharging only 20% only, I can't even see in what aplication that might be useful. 20 minutes runtime in a flashlight?

    • @ab_ab_c
      @ab_ab_c 8 років тому

      +OrbitalSP2
      A flashlight that isn't used much or often is a perfect example. I have a high power flashlight that I use occasionally around the house & I rarely use it for longer than 5 minutes in a day.
      A remote control that is placed on a wireless charging mat when not in use would be another good example.

    • @OrbitalSP2
      @OrbitalSP2 8 років тому

      A B they degrade with time, even by doing nothing with them. So I'd rather use them from 20 to 90% or 20 to 100%. Unless you live in a very very cold country, the ambient temperature is killing them anyways...

  • @mohsenbarmuz6670
    @mohsenbarmuz6670 Рік тому +1

    Thanks, Nice and beneficial Video, do you have a video about the rate discharge measurement of the Li ion battery?rate

  • @FrenchmansFlats51
    @FrenchmansFlats51 6 місяців тому

    you are missing a heavy schottky diode on the charge circuit (like a SR360) to protect the supply from reverse polarity on the Li battery.

  • @JasperJanssen
    @JasperJanssen 8 років тому +4

    The capacity graph in the data sheet says it switches from cc to cv at about 80-90%, not 50%.

    • @EEVblog
      @EEVblog  8 років тому +2

      It can be quite chemistry/manufacturer dependent.

    • @ArionRaine
      @ArionRaine 8 років тому +1

      Actually, it should say when the charger should switch from CC to CV. not when the cell does.

  • @OfflineSetup
    @OfflineSetup 8 років тому +9

    can I suggest a second video where you explain the problem of the original?

  • @stonent
    @stonent 8 років тому +1

    I was thinking if you calculated the right resistor, you could rig a transistor in there so that once the current goes too low (the cut-off point), the transistor breaks the connection to the battery.

  • @IsaacOLEG
    @IsaacOLEG 4 роки тому +1

    I did read that Lipo batteries are more dangerous to charge without a specific "balancing" charger . Then may be some balancing circuitry exists in my battery pack, not only a heat sensor and constant current constant voltage circuitry (?) I did unsold it from the batteries to be sure of what happens) thank you

  • @bigmac9712
    @bigmac9712 Рік тому

    So the voltage with which the battery is charged should always correspond exactly to the voltage that the battery has at exactly that point in time?

  • @Iowa599
    @Iowa599 10 місяців тому

    what if the psu is powered off but left connected to the battery?
    use a timer box thing, for the psu

  • @CyclingNeko
    @CyclingNeko 2 роки тому

    I have some questions.
    When at the phase of Constant current. Your lab power supply will force the current deliver to always stay at 1.7 A, right ? While the voltage from your PSU does not matter as long as does not pass 4.2V limit.
    And when the the voltage is at 4.2, your lab power supply will maintain the voltage at 4.2 from your PSU and let the current sinking?

  • @optimizelogicrepair2784
    @optimizelogicrepair2784 4 роки тому +1

    Hey Dave, can you do a video on how to “revive” a flat lipo pack? I see other UA-cam videos from others but it would be good to get your explanation on how or why this works.

  • @Asdafgaser
    @Asdafgaser 2 роки тому

    Great video and explanation!
    I'm really interested in the model of the wrist watch this fine gentleman is wearing. I cannot find it on the internet...

  • @jockemustafa
    @jockemustafa 7 років тому

    Thanks for uploading this. This made me finally charge my Canon camera LP-E6 battery with a constant current on 650mA and when reaching the maximum voltage of 8.4v i changed over to constant voltage and see exactly the same where the current starts dropping! Wow, i really need the camera tomorrow and you made me do it! Best youtuber EU! (i know you're not in the EU)

  • @telemedic5142
    @telemedic5142 2 роки тому

    Thankyou for this simple to understand tutorial. I now understand, mystery revealed :)

  • @ikorin
    @ikorin 8 років тому +2

    Hi Dave, could you please comment on the document from Rigol "Active loads and the RIGOL DP800 and DP1000 Series". It says "an external diode should be used to prevent the flow of current into the supply and prevent damage of the power supply".

    • @ikorin
      @ikorin 8 років тому +2

      But the problem with a diode... the voltage drop depends on "forward" current. I think it will be hard to apply precise 4.2V to the battery.

  • @Masterpj555
    @Masterpj555 2 роки тому

    are there any ic's that let you cut off charging when current reaches a certain minimum? I have been told its bad to keep lithium keep constantly float charging.

  • @turmat01
    @turmat01 2 роки тому

    Is there anyway to charge a multicell lipo with that? Each cell must stay as balanced as possible

  • @marlasota
    @marlasota Рік тому

    Can termination at 10% of charging current in the CV part of the curve be automated on DP832 / DP932?

  • @fatih3194
    @fatih3194 7 років тому +1

    thank you for talking about slowly rising voltage when in constant current mode but i saw something when i charge the battery with constant current mode . the voltage drop across battery was 4.2 v or around that. and voltage across the cell before charging was around 3,8 . so why is it behave like this. isnt it should be 3,8 v across the cell while charging it with constant current and slowly rise the voltage naturally like you show in the video ?

  • @WogChilli
    @WogChilli Рік тому

    How do I get my hands on some high current battery holders like those. I keep melting the thin gauge Jaycar ones out

  • @5eurosenelsuelo
    @5eurosenelsuelo 9 місяців тому

    Nice video!
    How about batteries with multiple cells in series? Is there a way to guarantee they are balanced using a power supply given the batteries have that additional connector they come with?

  • @blackfaithdoom9018
    @blackfaithdoom9018 Рік тому

    which are suitable power supplies to charge Li ion batteries , and which power supplies are a ""NO-GO "" ?

  • @TonyLing
    @TonyLing 4 роки тому

    Nice one again Daveo, totally trusted content. The absolute best.

  • @BagheeraTube
    @BagheeraTube 4 роки тому +1

    Have done this with one battery no problem, but if I do the same with 8 batteries in parallel, I still only get the same current as if I would charge one battery. So it will take 8 times longer to charge them together rather then one at the time. Why is that? It doesn't make sense.

  • @boblake2340
    @boblake2340 8 років тому +1

    If you use a low charging current, you can get away with a very simple circuit. I have a 5v solar cell that puts out 300 ma at 3.5 volts, down to 25mA or so at 4.2 volts. I determined the current values empirically for my setup (expected illumination conditions) before proceeding. Works perfectly on this kind of cell, it just takes a day or so. I can leave the cell connected indefinitely with this setup. Works great if you're not in a hurry for that charge. I use a number of cells that I cycle through.

    • @ABaumstumpf
      @ABaumstumpf 8 років тому +2

      Well - as long as you 5V solar cell really never goes above 4.2 V that is.
      getting the cell to 4.3 v a single time might already destroy it completely.

    • @boblake2340
      @boblake2340 8 років тому +2

      ABaumstumpf Its a new setup, about 10 days old now. The solar cell only puts out a trickle of current maybe one hour a day, when the battery is full. I will be watching it closely for a while. You are right in that it is an iffy setup. A bit of an experiment, which, so far, appears to be working.

    • @melkiorwiseman5234
      @melkiorwiseman5234 5 років тому

      I use a similar set-up, but I always use either protected cells or cells to which I've added a protection circuit. That ensures that once the cell has received a full charge, it won't over-charge and also once it discharges too low, the output will cut off.

  • @FixitFox
    @FixitFox 5 років тому

    I'm a bit confused.. Why does it say 3.7V on the battery but we charge it to 4.2V?
    ...Even the datasheet says to charge it at 4.2V but the "nominal voltage" of the battery is 3.6/3.7V

  • @castro1780
    @castro1780 8 років тому +7

    How do I change my power supply screen to a video monitor like you have in the thumbnail? I could really use that.

    • @Aperson-sv2hc
      @Aperson-sv2hc 8 років тому

      Wow, lol.

    • @bm256industries
      @bm256industries 8 років тому

      This will most likely be done in Photoshop, GIMP or some other image editing tool in post-production.

  • @MarshallSmith27
    @MarshallSmith27 7 років тому +2

    I'm about to buy my first power supply. I will be charging the occasional cell with it and powering amplifiers and small circuits. Should I be looking for Linear or Switching?

    • @CoolKoon
      @CoolKoon 7 років тому

      Marshall Smith Are there any adjustable linear power supplies on the market?

  • @redsquirrelftw
    @redsquirrelftw 8 років тому +1

    Since cells vary, how do "smart chargers" determine the proper rate for different cells? Are they all similar enough that they can just use a conservative value?

    • @melkiorwiseman5234
      @melkiorwiseman5234 5 років тому

      That's pretty much the case. If you're sure you'll always be charging an 18650, you can use a low charge current such as 500mA and most of the time that will be fine since nearly all batteries of that size are at least 2000mAh in size, except for those cheap Chinese rip-offs. The charging current could be too high for some of those.
      On the other hand, some of the tiny flat cells can be as low as 150mAh, so you'd need a charger which goes as low as 75mA to safely charge those. It would take ages to charge an 18650 at that current, so there's no such thing as a truly universal lithium charger with a fixed charging current.
      "Smart" chargers generally either assume you'll be only charging a certain physical size of battery or rely on you to set the charge current.

  • @Ra-zor
    @Ra-zor 7 років тому

    cant remember where but somewhere I read a while back that if they drop below 2.5v for any real length of time (a few months+) a chemical reaction takes place that can cause sudden internal partial/total shorts and possible fire/severe heat and venting, hence why the protection circuit will not allow you to charge a cell if it drops below about 2.5v. You can usually tell if a cell has a problem as it gets warm as you charge it... and a very good reason not to use unprotected cells...

    • @thedausthed
      @thedausthed 6 років тому

      That is an old wives tall (I have charged a battery that was at 1.4V for a few years without it heating up or swelling), the main damage comes from when the cell voltage is reversed.

  • @sharperguy
    @sharperguy 4 роки тому +1

    Hey would you do a strip down of any "vaporizer" regulated battery modules? They generally use 18650 batteries to heat a coil which vaporises liquid. I think it's interesting from an EE perspective because these mods measure the resistance of the coil, and use some kind voltage stepper to allow you to select a wattage for powering the coil.

  • @paulmartin8051
    @paulmartin8051 3 роки тому

    do you set the voltage equal to 4.2 multiplied by the number of batteries in series so for example, 10s would be 42V

  • @TheAnalogKid2
    @TheAnalogKid2 8 років тому

    How about instructions on how to setup the DP832 to automatically charge these suckers?

    • @stargazer7644
      @stargazer7644 8 років тому

      That's what the video is. Set the voltage limit to 4.2V, set the current limit to 1.7A. Turn it off after 4 hours or when it reaches 65ma charge current. Bob's your uncle.

  • @x_ma_ryu_x
    @x_ma_ryu_x 3 роки тому

    1 what is the red line on the graph in the data sheet
    2 when you go to constant voltage, how, why does the current drop. Its pretty clear what happens in the constant current phase, but then what is the magic

  • @nachbelichtet
    @nachbelichtet 8 років тому

    Any recommendations about charging a 7.2 Volt Li-Ion camera battery pack like a Sony NP type?

  • @H3adcrash
    @H3adcrash 8 років тому +8

    I remember when Chris Boden of The Geekgroup kicked me out of their IRC for explaining how you do this. According to him it's insanely dangerous and should never be done. He seriously knows fuck all about a lot.

    • @nickjohn2051
      @nickjohn2051 8 років тому

      Why it is dangerous? This is Li ion not LiPO battery. So the explosive is not in the equation. Also Li Ion already has built in BMS or PCB nowadays to protect battery from overvoltage or undervoltage.
      Any specific information about how do you kick from IRC? He should explain why it is dangerous and the explanation behind it.

    • @H3adcrash
      @H3adcrash 8 років тому

      You ask him.. He apparently knows more than anybody else in this world. He's also the guy who claimed that Corning optical USB cables don't work because "USB is a fussy bitch" ? Fake it till you make it..

    • @Arek_R.
      @Arek_R. 8 років тому +3

      These cylindrical li-on cells are safe, even these without afterparty protection circuits, because cell has inside safety pressure valve, fuse, and CID button(opens circuit when overheated).
      But if you will smash positive side(where all these protections are) battery may turn into flamethrowner or even explode if overloaded, overheated or overcharged.

    • @SianaGearz
      @SianaGearz 8 років тому

      USB is indeed a fussy bitch! Implementing an interrupt or iso endpoint by hand in USB 1.1 and 2.0 gives me massive shivers.
      But something interesting happened. Earlier USB protocols were limited by cable length because of latency issues. USB 3.0 apparently has ways of working around that.
      Also i have a slight hunch of how some re-synchronization could be implemented for earlier protocols to offset latency of signal-converting electronics. But it would take a person a million times better than me to actually accomplish that.
      But who is this Chris Boden person anyway? Never heard of them.

    • @CoolKoon
      @CoolKoon 7 років тому

      Electricguy Well, as long as you know what you're doing (and disconnect the battery at or near the cutoff current), it's fine. I'm not sure if I'd want complete amateurs attempt something like this though....

  • @4mb127
    @4mb127 8 років тому

    It's like you read my mind. I would also like to know the differences between charging LiFePO and this one.

  • @alexthepunk
    @alexthepunk 8 років тому

    I bought this same power supply because Adafruit suggested it. I'm glad to see someone else using it. I love my power supply, and yes I do remember when Dave bought this with the upgraded software. It's still nice to see someone else using it.
    Can someone quickly tell me how to set the low current cut off that he didn't want to show in the video?

    • @John_Ridley
      @John_Ridley 8 років тому +1

      I'd love to get that supply, but it's way too rich for my blood. I have the $50 ebay special,which also can do this but it's a lot more of a bugger to set exact values on.

    • @Hyxtryx
      @Hyxtryx 8 років тому

      You press the button underneath the display labeled "current", and dial in the setting the same way you do for voltage.

    • @alexthepunk
      @alexthepunk 8 років тому

      That's setting the current limit. I'm talking about shutting it off when the current gets too low.

    • @chrispychickin
      @chrispychickin 8 років тому

      as far as i can tell, he was talking about setting a cutoff timer after x hours. I don't have the supply myself, but there's a timer button visible on the front- maybe that can help. Or just read the manual :)

    • @kissingfrogs
      @kissingfrogs 8 років тому

      I have experimented with using python via telnet and VBA (in excel) via VISA to DP831 to status and control. Works very well. DP831 (DP832 would be almost the same to control) is very open and relatively straightforward to control via ethernet. Suspect USB would also be an option.
      Python would be my first option for battery charge control. Could also add safety shutdowns by monitor for weird battery behaviour like increasing current over time and OFF the output.
      There was some clever front panel tricks hinted at in the manual that may help with with battery charging but I glossed over these as I figured programmatically would be the most flexible fastest approach for me.

  • @CoolDudeClem
    @CoolDudeClem 8 років тому +4

    Wasn't this already uploaded already?

    • @Arek_R.
      @Arek_R. 8 років тому

      It was, in moment when I was typing very long and informative comment and then it gone... :

    • @rich1051414
      @rich1051414 8 років тому

      Wasn't already said already? Love your vids clem :)

  • @Luftbubblan
    @Luftbubblan 11 місяців тому

    Tyvm for good a explanation. I don't know anything about electronics but i recently did this a couple of times with a homebuilt powersupply/lab. I only charged it for short periods tho and monitoring it while doing so but it feels a bit sketchy when not having the knowledge :D My battery was 500mah and i charged it at 0.5a tho but now i know to lower that! My voltage setting was not set by specs, more based on some quick basic values i found online that semt to correlate somewhat to the battery type. I did have in consideration that the battery could go poof while trying this.

  • @abdulazizalkaabi3627
    @abdulazizalkaabi3627 Рік тому

    Can I use the same method to charge (18650) 36V 9600 Ah battery pack?

  • @snorttroll4379
    @snorttroll4379 11 місяців тому

    ok. could you reccommend some cehap ali express type chargers that would work for charging battteries?

  • @Subparanon
    @Subparanon 6 років тому

    A question. Say that you wanted to charge a battery while it's in use. Similar to how a laptop charges it's battery with the power on. I take it that all you would need is a battery charger in parallel with the battery that is capable of putting out enough current both to power the device as well as top up the battery. Since the charger would limit voltage to 4.2 and reduce amperage as the battery charges, this should work right? I want to convert a remote control vehicle to be able to self charge with a dock and always be on, for a security robot.

  • @expertmax32
    @expertmax32 8 років тому +1

    That would be an interesting arduino project : LiPo smart charger.

  • @БогданМура
    @БогданМура Рік тому

    When my 18650 at 3.5 can get current 25A and be at 3.5V, what happened? 🤔

  • @huangbinapple
    @huangbinapple 4 роки тому

    Can you charge a Li ion battery pack(13 serial for example) using this power supply method?

  • @user-rn3eb2jn5t
    @user-rn3eb2jn5t 11 місяців тому

    Hi great video! If a battery's rated capacity is 6820 mAh, do you set your power supply's current to 6.8 amps?

  • @bitsurfer0101
    @bitsurfer0101 4 роки тому

    Could you do a video on how to create a float charger?

  • @puchu9507
    @puchu9507 3 роки тому

    What happens if I set CV to 4V instead of 4.2 and CC to 500mA ?

  • @amirb715
    @amirb715 6 років тому

    any idea what settings could I use for charging NiZn batteries? they are 1.6V AAA and AA sizes

  • @dankollars4501
    @dankollars4501 4 роки тому

    just wondering, if i was to charge 2 of these batteries in series, would i charge them 8.4 volts 1.7a for 4 hours max?

  • @muraturile
    @muraturile 7 років тому

    PLEASE tell me how can i recharge a 12 volts motorcycle battery with Sorensen DCS50-40M16 power supply ?

  • @SimonEllwood
    @SimonEllwood 8 років тому +3

    Why not just use a mains timer to turn of the PSU after 4 hours?

    • @gregfeneis609
      @gregfeneis609 7 років тому

      That could work, assuming the dead PSU won't begin to discharge the battery after it loses power.

  • @tompryor3034
    @tompryor3034 3 місяці тому

    Can I charge the li-ion battery with a lipo charger?

  • @osmoregulator
    @osmoregulator 8 років тому

    Great video bro, but at the beginning of the video you tell that you don't know the cut-off current, albeit it is written clearly on the datasheet and you will reference it later.

    • @EEVblog
      @EEVblog  8 років тому

      That's because I didn't see early in the video when I recorded that.

  • @dawn1berlitz
    @dawn1berlitz 8 років тому

    i kinda wonder how they spot weld these types of batteries safely i have thought of rebuilding a mid09 macbook battery pack with fresh cells but i would have to find them one with a spotwelded tab that can already be soldered to safely

    • @melkiorwiseman5234
      @melkiorwiseman5234 5 років тому

      It's possible to build a spot-welder which uses a car battery, but there are relatively cheap spot-welders suitable for the purpose. I got one off eBay.

  • @jonggeronimo7056
    @jonggeronimo7056 8 років тому

    in constant current mode, can i use my constant current circuit 12v supply 500ma? then if the batt voltage is 4.2v ill disconnect

  • @johnmoor8839
    @johnmoor8839 5 років тому

    thank god for eev. have you see some of the other videos out there....

  • @RiediProjects
    @RiediProjects 5 років тому

    Can you charge your battery at less that half capacity?

  • @hugbearsx4
    @hugbearsx4 8 років тому

    I understand there's a place in the market for bare LiPo cells, without any circuitry built-in. However, is there ANY reason that, for those WITH built-in protection, the manufacturers would not include a charging management circuit so that these could be charged from any general power source (say the usual 5V to 12V PSUs usually found around the house)?

    • @melkiorwiseman5234
      @melkiorwiseman5234 5 років тому +1

      Extra circuitry = extra expense. But I have seen a few cells on eBay which have both a charging circuit and protection circuit built in. They generally have a 5V mini-USB port on the side near one end for charging.

  • @Raptorman0909
    @Raptorman0909 8 років тому

    Funny thing is I only recently received my DP832 bench power supply and have used it to charge a couple 18650 batteries.

  • @lansraad6142
    @lansraad6142 6 років тому

    Is it ok to have you LiPo to be over its 3.7v that it says on itself? If I kept my charger running at 4.2V then the battery voltage would rise to 4.2V. Same thing goes to Li-ion batteries.

    • @thedausthed
      @thedausthed 6 років тому

      That "3.7V" is just the nominal voltage, if you only charged them up to that you would have only about half their capacity available.

  • @timothycampbell4705
    @timothycampbell4705 7 років тому

    You say to charge it for 4 hours. But what if the battery was not completely dead? What if it was halfway charged or three quarters of the way charged? Should you still charge it for 4 hours?

    • @melkiorwiseman5234
      @melkiorwiseman5234 5 років тому

      No. Although you're unlikely to badly damage the battery in 4 hours so long as the constant voltage and current are correctly set.

  • @Capturing-Memories
    @Capturing-Memories 8 років тому +1

    Have you played with some MPPT solar charge controllers? I'm wondering if there is one useful solar charge controller that can charge a pack of 18650 equipped with a BMS? The only one that I could find and can be programmed via their software on a PC is ProStar MPPT from MorningStar and it's like $480, Some other manufacturers charge a $150 fees on top for factory programing.

    • @melkiorwiseman5234
      @melkiorwiseman5234 5 років тому

      You can now get solar charge controllers which can be switched between modes to charge either lead-acid batteries or lithium batteries.

  • @ruisimoes3638
    @ruisimoes3638 4 роки тому +1

    Hi! Nice tutorial! I have one question, maybe you know the answer. My charger doesnt have a Li Ion charging setup program. Can one use a LiPo program instead? with limited charging current of 10% of the battery mAh? LiPo programs limit the voltage to 4.2v, so.. i guess i would be ok. right?

    • @JohnUsp
      @JohnUsp 3 роки тому

      YES, and 10% is the standard rule, this video skipped this important point.

  • @ntag411
    @ntag411 4 роки тому

    The thing today is reviving a dead battery back. Personally to me the method used by many is to zap the pack, with a like good battery by connecting the packs in parallel for seconds, is haphazard.
    While it is politically not proper for the consumer to rejuvenate a pack, having to scrap a pricey pack within months of purchase is a waste.
    The pack I rejuvenated is a 18v, 36AH Hoover Links vacuum cleaner. It consists of 5 18650 cells in series and with a large circuit board. Each cell measured 0.14v except one, that one cell was 0.010v. This cell I charged at 15mA with the supply set at CC. The corresponding voltage was 0.5v and CV set to the same. Once the supply switched from CC to CV, I gradually, increments, set the CV higher while keeping the CC the same. Initially the supply took about an hour to switch from CC to CV, this change caused the current of 15mA to go 0.0mA. Eventually ended the charge on each cell at 4.0v with CC at 200mA, once the cell voltage reached 4.0v the charge current will drop to 0mA.
    The pack appears to work OK now but unknown as to life compared to non rejuvenated pack. The battery packs appear to run at high drain because the vacuum only runs for 15 minutes when the motor goes noticeably slower and the power low battery indicator flashes. I suggested to the users of the vacuum to stop using when the indicator flashes/or sound of motor becomes weak. Do not run until it dies.

  • @jeffreysanchez9964
    @jeffreysanchez9964 3 роки тому

    I needed this video. It helped me thanks.

  • @soothcoder
    @soothcoder 8 років тому

    Umm potentially stupid question - so if you had a funky multi-channel PSU like yours, could you connect adjacent channels and charge a multi-cell battery safely? So connect channel 1 minus to battery minus, channel 1 plus to balance port between cell 1 and 2 and to channel 2 minus then channel 2 plus to next balance port and so on until plus of last channel goes to battery plus

  • @System0Error0Message
    @System0Error0Message 8 років тому

    you gotta try this with your phone's battery. No danger of cheap wall usb chargers and faster charging.

  • @bobskie321
    @bobskie321 5 років тому

    Can a Li-Ion accept a constant voltage of 4.2 volts continuous for several years without damaging the cell as a backup similar to a UPS?

  • @rudigerhoppe5708
    @rudigerhoppe5708 8 років тому

    How do I charge a 4s1p pack of those cells? 16,8V, same current, same timing?

    • @chrispychickin
      @chrispychickin 8 років тому

      buy a balancing charger for 20 bucks - or if you're a cheapskate, hook into individual cells through the balance lead, and charge them like in the video, 4 times

    • @rudigerhoppe5708
      @rudigerhoppe5708 8 років тому

      +Chris Tate I did buy one, it's on it's way from China. I did it single cell just to see the results. Works. But you know what? Battery still is empty and I would like to charge it a bit faster than 4 times 4 hours. Thanks for the help.

  • @mirarzaamplification902
    @mirarzaamplification902 2 роки тому

    Hi, I'm little confused on a constant current state. It looks like it just limit the current to a set limit so its kind of a current limiter. Does the battery itself lower the current it pulls in the psu when it reaches 4.2V? I have a DIY 12V lead acid battery charger but i'm confuse because the current doesn't stay in the current limit it drops slowly while the voltage is rising slowly too. Maybe my battery is broken? My charger is a iron transformer type but has a switch mode buck converter with current and voltage limit setting feature.

  • @evanleebodies
    @evanleebodies 4 роки тому +1

    What if one decides to undercharge the cell (to 4.0V say), can you keep the power supply connected indefinitely?

    • @craigs7181
      @craigs7181 4 роки тому +1

      No. Always keeping a li-ion cell at or near its maximum voltage can greatly reduce its life span. For long term storage, they should be at about 3.6v. If you are going to charge it up, use it

  • @ehsankazemi3316
    @ehsankazemi3316 7 років тому +1

    @eevblog
    Hi,
    I tried this method for charging Li-ion batteries but when I set my power supply to 4.2 v the current drawn by battery never goes higher than ~200 mA. The current will be increased only if I set voltage higher than 4.2v. At ~8 V, for instance the current is ~1.5 A.
    Could anybody tell me what's wrong?

    • @melkiorwiseman5234
      @melkiorwiseman5234 5 років тому

      It sounds like your battery is damaged. I presume your current limit is set higher than 200mA? Did you check the battery mAh capacity and set the current limit to half that? If all else is okay, then your battery is almost certainly damaged.

  • @NunoRVOliveira
    @NunoRVOliveira 8 років тому

    I have a 4.2v transformer that outputs 500mA and if I draw more current the voltage drops but it never goes above 800mA. Am I doing something wrong or is this a good way of charging my 18650?

  • @olasoderlind5685
    @olasoderlind5685 5 років тому

    USB chargin 5 wolt to controler ship?
    and how to charge arrays of baterys like electic bikes ?

    • @bzb4869
      @bzb4869 5 років тому

      Just calculate your max voltage based on how many cells in series, and your max current based on how many cells in parallel. For the 14S7P battery like the one I just built, and got impatient waiting for the "proper" charger to arrive, I used 57.5V (4.1V x 14) and I would have picked 10.5A (1500mA x 7) but my PSU is limited to 5A so they just charged more slowly. It worked like a charm - thanks EEVblog

  • @cfcreative1
    @cfcreative1 4 роки тому

    Can you do say 8AA batteries in series at the same time?

  • @rdbanks2823
    @rdbanks2823 8 років тому

    I was hoping you were going to do a bench supply charging video!!!!

  • @photolunatic4552
    @photolunatic4552 4 роки тому

    How can I charge 12V 55Ah AGM Lead Acid battery using a lab power supply (Korad KA3005P)? Any links appreciated. Cheers!

    • @davidbolha
      @davidbolha 4 роки тому

      Use a Ctek MXS 5.0 or Optimate 4 charger.

  • @Muonium1
    @Muonium1 8 років тому

    Does anyone know of any android apps that restrict the battery charge to 80% to reduce stress on the anode and prolong the life of the battery?

  • @longyinl
    @longyinl 3 роки тому

    I have a 4-cell in series Li-ion pack for my vacuum. Anyone knows if I can apply exactly the same technique here, or should the numbers be revised by multiplying 4 or dividing by 4?

    • @the415giant
      @the415giant 2 роки тому

      i charged my 4 pack vac battery at 16.8 v and 1.3 amps

  • @thespencerowen
    @thespencerowen 8 років тому

    Isn't it bad to leave lipos fully charged? I hear 3.8v per cell is the best / safest storage voltage.

    • @OrbitalSP2
      @OrbitalSP2 8 років тому

      Spencer Owen it's not dangerous but the life span of the cell will be reduced. Store it a 40 to 50% state of charge (around 3.8V).

  • @Kingshukpalchoudhury
    @Kingshukpalchoudhury Рік тому

    I have a confusion..
    While you say the charging current should be 1/2c.. so for a 3400mah , it is set at 1700ma
    But what about when charging a power Bank made out of say 2 of these.. What should be the charging current then..
    And, if the constant current is set at lower than 1/2c, i understand it will take longer to charge, but does it have any effect on its life span?
    Also, at some point you said that the constant voltage phase reduces life cycle..so does that mean we should omit it ?
    At what percentage of battery capacity does that constant voltage phase usually start?
    So is there a range in which there is a maximum life span?
    Is it the recommended 20-90 percent?

  • @empty0303
    @empty0303 8 років тому

    Hi, if the cell reaches 4.2V and the power supply is still using constant current to charge it, what would happen? thank you

    • @radius.indrawan
      @radius.indrawan 7 років тому

      if your power supply has been set for 4.2V and 1.7A limit, that case would never happen, as while the battery voltage is approaching 4.2V, the current it draws will decrease also. thus when it reach just below 1.7A, then the state switch from CC to CV, "automatically".

  • @lbeau819
    @lbeau819 7 років тому

    Dave, I can use a cheap manual set plugin mains timer + a mains relay to disconnect the batt + after 4hrs. Now, what's the situation with the diode mentioned somewhere below? What type and how connected or just thought, would it be at all necessary with my relay?

  • @BeetleJuice1980
    @BeetleJuice1980 6 років тому

    Why some people say that this can damage the power supply cause the battery will try to "charge" the power supply after the charging is done? They suggest using a diode and then it can be done.

  • @terrymackamckenzie6865
    @terrymackamckenzie6865 8 років тому +1

    Will this trick work on a Samsung Galaxy Note 7? Just bought about a 1000 of the little rippers for a bargain price, need to charge them all at the same time.

    • @stargazer7644
      @stargazer7644 8 років тому

      Just put 'em all in series and plug 'em into the wall socket. You'll be good to go in no time.

    • @CoolKoon
      @CoolKoon 7 років тому

      Star Gazer Actually with wall sockets being powered with 230 volts that would put a whopping 0.23 volts of AC on each cell. That'd hardly make the effect you were hoping for, would it?

    • @melkiorwiseman5234
      @melkiorwiseman5234 5 років тому

      You could charge them all at the same time, if you have a 1,500A charger...
      Realistically, you're better off charging maybe 10 at a time each from a separate charger. Charging circuits are cheap and you can generally get 10 for a few bucks from China.
      Unless you're going to use the notebook itself for charging, in which case you're better off just using the chargers supplied with them.