The 50A setting, well I don't know what it actually puts out and I've had a similar Schumacher charger with the same settings, and whatever it puts out, the significant thing is that it's a battery start charge. You can hook it up to a weak battery, set it to that setting and start the car in a few seconds (you'll have to run the car to fully charge the battery at that point), or you can hook it up to a pretty much dead battery (as long as it's not damaged) and wait about 5 minutes and you'll be able to start the car. With a few minutes of patience it basically lets you jump the car, quite a useful feature.
It give 50a until the internal circuit trips, which is about 2 seconds, so if the car can start in that 2 seconds, it works, I thinks is a limited use feature, newer cars might start that fast, but most slightly older cars will not
you have to plug the power cord into the wall, and connect the cables to the battery before it will start charging, that is a safety measure to keep the ends from touching and shorting out - thanks for subscribing!
the green light comes on when charged is full on 10 and 2 - used the 50 amp to jump my trunk once, but I did not notice what the light did when the truck started, I use this on our scooter batteries, jump my truck, and charge neighbors car battery when it goes dead - with covid a lot of people do not use their cars enough to keep the battery charged - thanks for subscribing!
it has a safety that will not allow it to come until it senses voltage from a connected battery that needs charged, this is to protect the charger and the user from a dead short if the clamps were to touch - a dead short at 2/10/50 would fry the charger, and could seriously hurt someone - I thought I covered this in the video, I'll have to post an update video covering that function - if you are charging a completely dead battery, you can hook another battery in parallel with the dead battery to charge the dead battery - thanks for subscribing!
mine does, and a lot of them do, any device that steps up or down voltage can hum, and the bigger the step up/down, the more likely and loudly they hum - this charger step the voltage from roughly 110v ac to roughly 12v dc - there are ways to change the design to eliminate the hum, the cost is rarely worth it, because they work just as well with or without the hum - to test this, find a power company transformer that is ground mounted, most of those have a loud hum, (pole mounted are just as likely to hum) - if they are humming, odds are its giving off stray RF that can be heard on radios - in summary - the hum does not impact performance - thanks for subscribing
@@snapwholeharborfreightreviews thank you....and this is random but if there is a spark when I first hook the charger to the battery does that mean there is a definite charge?
@@jubilee2343 its very normal to see sparks when you first hook it up, same thing when you plug something in to an outlet in your house, the speed you connect will after the sparks, faster is better, but overall, impossible to eliminate - that is a sign the battery has enough voltage for the charger to 'see' the battery and charge it, the charger will only charge a battery that has a minimum charge, this is a safety measure, otherwise anytime the two clamps touched there would a LOT of sparks
It's always better to charge a lead-acid battery at 0.1C (multiply the C rate times the Ah rating of battery) or lower. For example the battery you have there is a 35Ah battery and the ideal charge rate is 3.5 amps or lower. You are always better off not using high amperage boost modes unless absolutely necessary. If they drive the voltage up too high they can destroy modern vehicle electronics. A more ideal charger size for car batteries is usually in the range of 5-6 amps since most car batteries are going to be in the 50-80 Ah range.
I typically charge using the 10amp setting, then switch to 2amp, it has always worked for me ok, I have used the boost mode once and was very surprised it worked, truck was fine, the charger has never been the same since, it has trouble detecting a full charge now - I normally unhook the cables and put on the charger, but that one time I was running very late plus I've been wanting to try the boost feature- with covid and everyone working from home, my truck does not get much use since I don't have to drive to work now - thanks for the recommendation on charging, but very few battery chargers have the ability to fine tune the charging amperage to those limits, most certainly not a $30 HF automatic charger - thanks for subscribing
I just bought this exact same charger based on your review of it. So I tried charging a friend of mine's battery that was in one of her cars that hasn't been started in around 6 month's. I hooked up the charger, and none of lights on the charger came on. I'm assuming the battery is completely dead, that's why it won't charge, right ? Thank you in advance for your reply.
This exactly the problem, the batter is completely dead and the charger will not start charging unless it detects voltage from the battery, you can put another battery in parallel with the dead battery and charge both until the dead battery has enough of a charge to trigger the charger by itself - after 6 months dead, the battery might be damaged, once you get it charge and reading 12 v, you should use a load tester to determine if the battery is healthy - good luck and please post an update if you revive the battery - with covid, I don't drive my work truck as much, and about 3 times a year, I go too long between driving it and have to charge the battery, and this charge has saved me a lot of hassle and money - thanks for subscribing!
@snapwholeharborfreightreviews After I sent you the text , I noticed that the sides of the battery were bulging out , so I knew that wasn't a good sign ! I took it to a local parts store to have them check it out, and it was completely dead. I took my battery out of my truck , which I knew was good to check out the charger, set it on 10 amp, hooked it up, and the green light immediately came on saying it was charged. Seems to be a good charger. I don't have the need to need one on a regular basis, but I would rather have it and not need it than to need it and not have it ! Thanks for the video about the charger ! Very informative ! Thanks !
Nice review. I bought one but confused about when it reaches full charge. On mine the needle is on 100% after a few hours and the green light comes on but 5 seconds later the red light comes back on. This back and forth continues for awhile. Does this back and forth of red and green means it's done charging? Any info appreciated.
green means done, but it periodically does a recheck to see if the battery needs charged, if its flipping back and forth rapidly, its possible its sensing something wrong with the battery - I recommend charging on 10amp until done, then 2amp until done, the 2amp is a trickle charge and tops off the battery - thanks for subscribing
I bought this exact harbor freight charger about two weeks ago and it died that same day. The computer on the inside fried. I cut it out and hooked the transformer directly to the rectifier and presto, I got my $60 battery charger back, and cost me only a few minutes of my time.
inflation is pretty bad, i paid $30 for mine - i'm wondering - if it failed on day one, why you did not take it back for another one or for a refund? $60 for a dumb charger with no safety controls seems like an expensive charger, and an extremely dangerous charger, if you hook it up backwards the battery could blow up and acid would go everywhere, including on you, or let the clamps touch while its plugged in, and you will have a dead short, lots of potential deadly problems, I encourage you to return the charger to the store before someone is seriously injured - or just throw it away, not work the risk - thanks for subcribing!
@@snapwholeharborfreightreviews I wanted an old fashioned battery charger without the smart charger technology. That's why I cut out the computer. Smart charging takes too long charge any battery.
I have this charger and I'm trying to charge a motorcycle battery and I have it set on agm and when I try to charge on 10 amps and I'm getting a clicking noise and flashing between red and green light. On trickle its just a red light no clicking any clue whats going on?
switching red/green back and forth means you likely have a problem with your battery, or is low on water, search youtube for AGM water, adding water to AGM is a little controversial, let the 2 amp charge go for 48 hours, if it does not go green, there is likely a problem with your battery, one of the cells likely has a little damage, the battery can still be used, but will run down quicker than expected, you will need to try and use it to find its limits, after the 2 amp charge, try the 10 amp charge and see if it still does the red/green switch - the battery charger is computer controlled, so if the battery is not performing normally, the charger can't figure out what to do, it does not necessarily mean your battery is beyond hope, that is why I'm recommending going back and forth on the 2/10 settings - the 50 is just for jump starting your car, so don't use it - thanks for subscribing!
@@snapwholeharborfreightreviews thanks for your help. I charged on 2 amps and now light is green after 4/5 hours of charging. I took off charger for the night woke up hooked it back on the charger was red for 30 seconds. So I'm guessing battery should be good. I will have auto parts store test it.
@@jpolhamus71 I would not worry about the 30 seconds, did you try the 10 amp charge the next morning? parts store can test, but you can get a load tester at HF, good to have if you use lead acid batteries - my review - ua-cam.com/video/x8vh2xvETK8/v-deo.html - I use it to test my batteries about every 6 months, they get ran dead a few times a month, so I have to monitor them to be sure that abuse does not kill them - thanks for subscribing!
I'm mechanically challenged and am a little confused about starting a dead car battery with this charger. What is the procedure for doing that? Thanks.
damned good question. Apparently, according to all these paid shills for Harbor Freight, we're screwed.... charger apparently only works if battery is only partly discharged, but not in our real world where the battery gets drained..... To these comp'd shills for H/F, too bad, tough luck, your battery is history. (and what did you think, that the battery charger would actually, like, um.... charge the battery?)
wow - sorry you can't see the need for this important safety feature, which by the way is easy to work with - hook 2 batteries up in parallel and charge them for a few hours, that will get enough charge into the dead battery for the charger to work on it alone - the alternative would be a dead short when the clips touched each other, or a switch to turn the charger on/off, much safer to sense a battery connected correctly before energizing the charger - BTW, ask harbor freight about comps or paid shills, way to cheap for that, they require me to put a disclaimer that I am not affiliated with them, and I have absolutely no relationship with HF, and I get comments from others that can't afford HF tools, and take it out on me
@@snapwholeharborfreightreviews Ok how about a switch to bypass this function ? Or a breaker to reset if shorted. My Cen- Tech is fairly new and has started to cycle red /green on every thing. And yes they are low on charge.
@@kathybond9489 you can add an on off switch to your charger faily easily, just make sure its rated at least 50 amps (perferably 100 amps), a breaker would be a lot more work - do you have a battery load tester? in my experience flipping red/green is a sign the battery is border line bad - not always the case, but thats why I have a load tester, the charger is having trouble sensing the true state of the batter, it goes green because it senses the battery is charged, by design, it monitors the battery condition, and go to red when its needs charged, the cycling back and forth is because the battery is not hold the charge - change for subscribing!
It doesn't take much to get things going. A flashlight battery and wires across the posts is enough. Or any small power supply. Once its started charging remove.
I bought this exact battery charger. My battery appears a bit weak when starting in cold weather. My question is: Will the 2 amp Trickle Charge mode also switch to green and turn the charging off when it reaches full charge?
yes it should, but if your battery will not charge to 'full' it will not switch to green, this does not mean your battery is bad, just that its not perfect, and one of the cells is weak, leave it on the 10 amp until green, then the 2 amp trickle charge for 24 hours and if its not green, then its not going to get better, but the battery is probably still useable - thanks for subscribing!
AGM batteries are deep cycle batteries, which means they stand up to deep discharge better than transitional lead acid batteries, applications like - battery banks, scooters, UPS - Thanks for subscribing!
@hugh3rdof5 - you really need to take anger management - simple solution to your question, question already asked and answered to in the comments - btw I am in no way associated with harbor freight, so you should call their customer service and abuse them
can you give more detail on how it killed your battery? the battery was charged and and after charging with this charger there was no voltage coming from the battery? did the charge kick on when connected to the battery? there is a red light when the charger is charging and a green light when its done - more information about the state of your battery and the behaviour of your battery will help others evaluate your comment when making a decision about this charger - thanks for subscribing!
Is it safe to leave on 10amp overnight? I heard on one of these videos the unit will idle down once charged but can't find anything in the manual on charging situations.
yes its safe, this is a smart charger, it senses the batteries state and turns off when it is as charged as the 10amp can make it, then use the 2amp setting to 'top it off' - I use these process to keep my batteries in good shape, and it works great - thanks for subscribing!
My battery is 6 months old..after rig setting for a week it drained to 1.96 volts, maybe a parasitic drain. Hooked this charger up and i belive voltage was so low on battery the charger did not detect battery hooked up. No light came on and i checked voltage at clamps hooked to battery and nothing. Thought it was a bad charger. Took it back and got a new one and same thing. Maybe if voltage is so low this charger will not detect battery and turn on. Any thoughts any one
that is exactly what is happening - the charger has to detect voltage from the battery for it to energize the cables, its an important safety measure - wire two lead acid batteries in parallel and charge them for a few hours - that will give the dead one enough charge to trigger the charger - parallel is + to + and - to - between the two batteries, then hook them up to the charger, its still 12v, just 70AH, so it will work fine, thats how solar panels charge battery banks, thanks for subscribing!
same here. After returning first unit and trying to charge a battery I had removed from vehicle, the charging light never came on. Don't have a meter to see if any voltage in battery but I didn't realize the battery needed to have voltage for charger to work. HF was very good about exchange and then refund after 2nd charger wouldn't charge my battery.
That is clearly stated in the video, this is a safety measure, question of how to charge a dead battery has been answered many times in the comments - simple hook another battery in parallel and charge them both until the dead battery has enough charge to be charged by itself Thanks for subscribing!
I got one of these. Put it in the shed. Winter, car has been sitting. Went to start it, click, click. Checked cable connections, battery is too low to start the car, but I've got interior lights. Hooked up charger, says it's charging, check back in a few, cycling on and off. For laughs, hit the start function, it actually worked. So I went on a drive to charge the battery. Next winter, yesterday's major Blizzard went to move the car, no start, charger blinks, connection light random, does anything but charge. Hooked up an old shumaker, charged the battery. Tested the HD charger with my trolling motor battery, behaves fine. Shelved for that purpose because when it's below zero and you need to get the car started, it should just work. NFG in the real world. Tried twice, did bogus things, two strikes, your out.
I would not trust that battery, the charger is fine, this charge will not charge a totally dead battery, when you leave a car sitting, either unhook the battery or charge it about every 2 weeks, a car will drain the battery in about 2-3 weeks, after that it drains the battery to dead, and this charge will not charge a battery unless the battery has some life in it, its an a automatic charge, and that is a safety measure, to keep the clamps from short circuiting when they touch, odd but a smart charger does this to protect you, and a dumb battery charger will let you hurt yourself - thanks for subscribing!
Thanks SO much for explanation video - very useful and great information…
glad you found the video helpful - thanks for subscribing!
The 50A setting, well I don't know what it actually puts out and I've had a similar Schumacher charger with the same settings, and whatever it puts out, the significant thing is that it's a battery start charge. You can hook it up to a weak battery, set it to that setting and start the car in a few seconds (you'll have to run the car to fully charge the battery at that point), or you can hook it up to a pretty much dead battery (as long as it's not damaged) and wait about 5 minutes and you'll be able to start the car. With a few minutes of patience it basically lets you jump the car, quite a useful feature.
It give 50a until the internal circuit trips, which is about 2 seconds, so if the car can start in that 2 seconds, it works, I thinks is a limited use feature, newer cars might start that fast, but most slightly older cars will not
The fifty amp setting will kill that battery charger, or at least it killed mine.
I have a comment
Do you need to plug it in ? To make it work
you have to plug the power cord into the wall, and connect the cables to the battery before it will start charging, that is a safety measure to keep the ends from touching and shorting out - thanks for subscribing!
Great review!
Does the chargers green light come on when battery is fully charged when charging on 2 amp?
the green light comes on when charged is full on 10 and 2 - used the 50 amp to jump my trunk once, but I did not notice what the light did when the truck started, I use this on our scooter batteries, jump my truck, and charge neighbors car battery when it goes dead - with covid a lot of people do not use their cars enough to keep the battery charged - thanks for subscribing!
@@snapwholeharborfreightreviews Cool! Thanks again!
When plug in nothing comes on. Multimeter doesn't register any volts from the charger itself. So the problem is?
it has a safety that will not allow it to come until it senses voltage from a connected battery that needs charged, this is to protect the charger and the user from a dead short if the clamps were to touch - a dead short at 2/10/50 would fry the charger, and could seriously hurt someone - I thought I covered this in the video, I'll have to post an update video covering that function - if you are charging a completely dead battery, you can hook another battery in parallel with the dead battery to charge the dead battery - thanks for subscribing!
Should it make a humming noise while plugged in?
mine does, and a lot of them do, any device that steps up or down voltage can hum, and the bigger the step up/down, the more likely and loudly they hum - this charger step the voltage from roughly 110v ac to roughly 12v dc - there are ways to change the design to eliminate the hum, the cost is rarely worth it, because they work just as well with or without the hum - to test this, find a power company transformer that is ground mounted, most of those have a loud hum, (pole mounted are just as likely to hum) - if they are humming, odds are its giving off stray RF that can be heard on radios - in summary - the hum does not impact performance - thanks for subscribing
@@snapwholeharborfreightreviews thank you....and this is random but if there is a spark when I first hook the charger to the battery does that mean there is a definite charge?
@@jubilee2343 its very normal to see sparks when you first hook it up, same thing when you plug something in to an outlet in your house, the speed you connect will after the sparks, faster is better, but overall, impossible to eliminate - that is a sign the battery has enough voltage for the charger to 'see' the battery and charge it, the charger will only charge a battery that has a minimum charge, this is a safety measure, otherwise anytime the two clamps touched there would a LOT of sparks
@@snapwholeharborfreightreviews thank you
It's always better to charge a lead-acid battery at 0.1C (multiply the C rate times the Ah rating of battery) or lower. For example the battery you have there is a 35Ah battery and the ideal charge rate is 3.5 amps or lower. You are always better off not using high amperage boost modes unless absolutely necessary. If they drive the voltage up too high they can destroy modern vehicle electronics. A more ideal charger size for car batteries is usually in the range of 5-6 amps since most car batteries are going to be in the 50-80 Ah range.
I typically charge using the 10amp setting, then switch to 2amp, it has always worked for me ok, I have used the boost mode once and was very surprised it worked, truck was fine, the charger has never been the same since, it has trouble detecting a full charge now - I normally unhook the cables and put on the charger, but that one time I was running very late plus I've been wanting to try the boost feature- with covid and everyone working from home, my truck does not get much use since I don't have to drive to work now - thanks for the recommendation on charging, but very few battery chargers have the ability to fine tune the charging amperage to those limits, most certainly not a $30 HF automatic charger - thanks for subscribing
I just bought this exact same charger based on your review of it. So I tried charging a friend of mine's battery that was in one of her cars that hasn't been started in around 6 month's. I hooked up the charger, and none of lights on the charger came on. I'm assuming the battery is completely dead, that's why it won't charge, right ? Thank you in advance for your reply.
This exactly the problem, the batter is completely dead and the charger will not start charging unless it detects voltage from the battery, you can put another battery in parallel with the dead battery and charge both until the dead battery has enough of a charge to trigger the charger by itself - after 6 months dead, the battery might be damaged, once you get it charge and reading 12 v, you should use a load tester to determine if the battery is healthy - good luck and please post an update if you revive the battery - with covid, I don't drive my work truck as much, and about 3 times a year, I go too long between driving it and have to charge the battery, and this charge has saved me a lot of hassle and money - thanks for subscribing!
@snapwholeharborfreightreviews After I sent you the text , I noticed that the sides of the battery were bulging out , so I knew that wasn't a good sign ! I took it to a local parts store to have them check it out, and it was completely dead. I took my battery out of my truck , which I knew was good to check out the charger, set it on 10 amp, hooked it up, and the green light immediately came on saying it was charged. Seems to be a good charger. I don't have the need to need one on a regular basis, but I would rather have it and not need it than to need it and not have it ! Thanks for the video about the charger ! Very informative ! Thanks !
Nice review. I bought one but confused about when it reaches full charge. On mine the needle is on 100% after a few hours and the green light comes on but 5 seconds later the red light comes back on. This back and forth continues for awhile. Does this back and forth of red and green means it's done charging? Any info appreciated.
green means done, but it periodically does a recheck to see if the battery needs charged, if its flipping back and forth rapidly, its possible its sensing something wrong with the battery - I recommend charging on 10amp until done, then 2amp until done, the 2amp is a trickle charge and tops off the battery - thanks for subscribing
I bought this exact harbor freight charger about two weeks ago and it died that same day. The computer on the inside fried. I cut it out and hooked the transformer directly to the rectifier and presto, I got my $60 battery charger back, and cost me only a few minutes of my time.
inflation is pretty bad, i paid $30 for mine - i'm wondering - if it failed on day one, why you did not take it back for another one or for a refund? $60 for a dumb charger with no safety controls seems like an expensive charger, and an extremely dangerous charger, if you hook it up backwards the battery could blow up and acid would go everywhere, including on you, or let the clamps touch while its plugged in, and you will have a dead short, lots of potential deadly problems, I encourage you to return the charger to the store before someone is seriously injured - or just throw it away, not work the risk - thanks for subcribing!
@@snapwholeharborfreightreviews I wanted an old fashioned battery charger without the smart charger technology. That's why I cut out the computer. Smart charging takes too long charge any battery.
@@sandasturner9529 u live on the edge huh
I have this charger and I'm trying to charge a motorcycle battery and I have it set on agm and when I try to charge on 10 amps and I'm getting a clicking noise and flashing between red and green light. On trickle its just a red light no clicking any clue whats going on?
switching red/green back and forth means you likely have a problem with your battery, or is low on water, search youtube for AGM water, adding water to AGM is a little controversial, let the 2 amp charge go for 48 hours, if it does not go green, there is likely a problem with your battery, one of the cells likely has a little damage, the battery can still be used, but will run down quicker than expected, you will need to try and use it to find its limits, after the 2 amp charge, try the 10 amp charge and see if it still does the red/green switch - the battery charger is computer controlled, so if the battery is not performing normally, the charger can't figure out what to do, it does not necessarily mean your battery is beyond hope, that is why I'm recommending going back and forth on the 2/10 settings - the 50 is just for jump starting your car, so don't use it - thanks for subscribing!
@@snapwholeharborfreightreviews thanks for your help. I charged on 2 amps and now light is green after 4/5 hours of charging. I took off charger for the night woke up hooked it back on the charger was red for 30 seconds. So I'm guessing battery should be good. I will have auto parts store test it.
@@jpolhamus71 I would not worry about the 30 seconds, did you try the 10 amp charge the next morning? parts store can test, but you can get a load tester at HF, good to have if you use lead acid batteries - my review - ua-cam.com/video/x8vh2xvETK8/v-deo.html - I use it to test my batteries about every 6 months, they get ran dead a few times a month, so I have to monitor them to be sure that abuse does not kill them - thanks for subscribing!
I have a Gel motorcycle battery do I set it on AGM
yes, that is correct - thanks for subscribing!
I'm mechanically challenged and am a little confused about starting a dead car battery with this charger. What is the procedure for doing that? Thanks.
damned good question. Apparently, according to all these paid shills for Harbor Freight, we're screwed.... charger apparently only works if battery is only partly discharged, but not in our real world where the battery gets drained..... To these comp'd shills for H/F, too bad, tough luck, your battery is history. (and what did you think, that the battery charger would actually, like, um.... charge the battery?)
wow - sorry you can't see the need for this important safety feature, which by the way is easy to work with - hook 2 batteries up in parallel and charge them for a few hours, that will get enough charge into the dead battery for the charger to work on it alone - the alternative would be a dead short when the clips touched each other, or a switch to turn the charger on/off, much safer to sense a battery connected correctly before energizing the charger - BTW, ask harbor freight about comps or paid shills, way to cheap for that, they require me to put a disclaimer that I am not affiliated with them, and I have absolutely no relationship with HF, and I get comments from others that can't afford HF tools, and take it out on me
@@snapwholeharborfreightreviews Ok how about a switch to bypass this function ? Or a breaker to reset if shorted. My Cen- Tech is fairly new and has started to cycle red /green on every thing. And yes they are low on charge.
@@kathybond9489 you can add an on off switch to your charger faily easily, just make sure its rated at least 50 amps (perferably 100 amps), a breaker would be a lot more work - do you have a battery load tester? in my experience flipping red/green is a sign the battery is border line bad - not always the case, but thats why I have a load tester, the charger is having trouble sensing the true state of the batter, it goes green because it senses the battery is charged, by design, it monitors the battery condition, and go to red when its needs charged, the cycling back and forth is because the battery is not hold the charge - change for subscribing!
It doesn't take much to get things going. A flashlight battery and wires across the posts is enough. Or any small power supply. Once its started charging remove.
I bought this exact battery charger. My battery appears a bit weak when starting in cold weather. My question is: Will the 2 amp Trickle Charge mode also switch to green and turn the charging off when it reaches full charge?
yes it should, but if your battery will not charge to 'full' it will not switch to green, this does not mean your battery is bad, just that its not perfect, and one of the cells is weak, leave it on the 10 amp until green, then the 2 amp trickle charge for 24 hours and if its not green, then its not going to get better, but the battery is probably still useable - thanks for subscribing!
Vehicles that have stop/start function will have AGM. AGM batteries for a multitude of good reasons are used on a large number of quality vehicles.
AGM batteries are deep cycle batteries, which means they stand up to deep discharge better than transitional lead acid batteries, applications like - battery banks, scooters, UPS - Thanks for subscribing!
@hugh3rdof5 - you really need to take anger management - simple solution to your question, question already asked and answered to in the comments - btw I am in no way associated with harbor freight, so you should call their customer service and abuse them
Just bought one yesterday and it killed my battery on 10 Amp, left it on overnight on trickle and I didn't even gain a charge
can you give more detail on how it killed your battery? the battery was charged and and after charging with this charger there was no voltage coming from the battery? did the charge kick on when connected to the battery? there is a red light when the charger is charging and a green light when its done - more information about the state of your battery and the behaviour of your battery will help others evaluate your comment when making a decision about this charger - thanks for subscribing!
Is it safe to leave on 10amp overnight? I heard on one of these videos the unit will idle down once charged but can't find anything in the manual on charging situations.
yes its safe, this is a smart charger, it senses the batteries state and turns off when it is as charged as the 10amp can make it, then use the 2amp setting to 'top it off' - I use these process to keep my batteries in good shape, and it works great - thanks for subscribing!
My battery is 6 months old..after rig setting for a week it drained to 1.96 volts, maybe a parasitic drain. Hooked this charger up and i belive voltage was so low on battery the charger did not detect battery hooked up. No light came on and i checked voltage at clamps hooked to battery and nothing. Thought it was a bad charger. Took it back and got a new one and same thing.
Maybe if voltage is so low this charger will not detect battery and turn on. Any thoughts any one
that is exactly what is happening - the charger has to detect voltage from the battery for it to energize the cables, its an important safety measure - wire two lead acid batteries in parallel and charge them for a few hours - that will give the dead one enough charge to trigger the charger - parallel is + to + and - to - between the two batteries, then hook them up to the charger, its still 12v, just 70AH, so it will work fine, thats how solar panels charge battery banks, thanks for subscribing!
same here. After returning first unit and trying to charge a battery I had removed from vehicle, the charging light never came on. Don't have a meter to see if any voltage in battery but I didn't realize the battery needed to have voltage for charger to work. HF was very good about exchange and then refund after 2nd charger wouldn't charge my battery.
if your battery is completely dead this charger won't work.
That is clearly stated in the video, this is a safety measure, question of how to charge a dead battery has been answered many times in the comments - simple hook another battery in parallel and charge them both until the dead battery has enough charge to be charged by itself Thanks for subscribing!
Thanks.
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I got one of these. Put it in the shed. Winter, car has been sitting. Went to start it, click, click. Checked cable connections, battery is too low to start the car, but I've got interior lights. Hooked up charger, says it's charging, check back in a few, cycling on and off. For laughs, hit the start function, it actually worked. So I went on a drive to charge the battery. Next winter, yesterday's major Blizzard went to move the car, no start, charger blinks, connection light random, does anything but charge. Hooked up an old shumaker, charged the battery. Tested the HD charger with my trolling motor battery, behaves fine. Shelved for that purpose because when it's below zero and you need to get the car started, it should just work. NFG in the real world. Tried twice, did bogus things, two strikes, your out.
I would not trust that battery, the charger is fine, this charge will not charge a totally dead battery, when you leave a car sitting, either unhook the battery or charge it about every 2 weeks, a car will drain the battery in about 2-3 weeks, after that it drains the battery to dead, and this charge will not charge a battery unless the battery has some life in it, its an a automatic charge, and that is a safety measure, to keep the clamps from short circuiting when they touch, odd but a smart charger does this to protect you, and a dumb battery charger will let you hurt yourself - thanks for subscribing!