I plugged my losi 2200mah 4s lipo on my charger and it gave me an error that saids low voltage. I couldnt get it to charge. I checked the cells and i have one on 0 and the rest were on 3.7. I didnt know what to do so i decided to connect the lipo with out the balancer and charged it until i saw the voltage go up. Then i connected the balancer and all my cells started to charge. Did i do something i wasnt supposed to do, to get the dead cell to work again or is there another way to repair the cell? Does it supposed to get warm while charging?

Other people have brought back cells the way you did, but I'd be very careful when charging that battery, and also when you are using it.

+1 You did the right thing to get the voltage in that one cell up to charge it, but since that happened, look out for that pack. Replace it if you can. Call Horizon.

When i connected the battery without the balancer i didnt put the charge on that one dead cell it did it to all of them. I have the Triton Eq charger but dont really know how to use it. Is that also ok to do?

Lipos should not get very warm at all while charging. The likely reason yours are getting warm is because the charger is struggling to balance the other cells with the weak one(s). I would charge at a slow rate the first few cycles and carefully monitor the individual cell voltages. Many packs will be fine after this type of problem, but it is possible the pack could have future problems.

This was fine to do if any of the other cells were not over charged during that process. Once you connected the balancer the charger should stop if any cell goes too high. Even after you connect the balancer, if the one cell is very low, it may not be able to charge fast enough before the other cells reach full. The balancer only draws 300mA from the stronger cells. You will want to set the charger to Balance Charge mode, at 0.3A or less, and monitor cell voltage to ensure none of them go over 4.2V.

i have brought quite a few batteries back from low voltage but if it was zero volts then it is guaranteed to be damaged and lost capacity. check for swelling and charge slowly with a balance on. check voltage on each cell very often. any cell with over 4.2v is dangerous. if you can get the battery full charged and balance with all cells at 4.2v then you can try to use it some but be careful of voltage drop. check the cell that was at zero every minute while discharging and see if the voltage has dropped to 3.0v or less. most likely it will do this much earlier than any other cell in the pack. the best thing to do if it doesnt hold as much capacity as it needs to be useful is to remove the bad cell and make it a 3s pack if the bad cell is on the end of the pack and you have good soldering skills.

the things i check to see if a cell is "healthy" are: is voltage between 3.0-4.2v, does the cell stay cool while charging, is the cell nice and flat (no puffing/swelling and no bends or physical damage).

some more advanced stuff is if the voltage is nice and steady during charge and discharge and is the capacity 80% or better of original rating. you have to watch the screen on your triton to see this stuff.

i helped him w/ this n as i was watching it charge n balance all cells where getting an even amount it stayed cool until the near end when they topped off at 4.2 each cell and some of the swelling did get reduced

so you guys suggest we discharge it and recharge to see if the cell is still bad

Well we charge the lipo and it lasted us at least 5 min or so. I think that one cell the lipo has is dead and it doesnt hold charge. I know the other 3 cell were up to 4.2. Im gonna give it one more try to charge it and look at each cell and see what it does.

Usually if a cell is truly at zero voltage, its badly damaged and it will not function correctly like you've already fouind out. It may charge, but it will not produce current the way its supposed to due to the damage.


I don't see it will getting any better.