CoryRC

iTrader: (21)

So I haven’t used this battery since I bought it used. It is a Pro match 6500 4S. Checked the voltage and cells read 1 @ 3.78V [email protected] [email protected] [email protected]

I know storage they are suppose to be at 3.85 for storage. Is there anyway to bring cell 4 back up or is that cell dead?

What is the best way to dispose of these batteries? Any place recycle them? I always put my batteries in storage mode, so not sure how this happened. Pretty sure I checked them when I first got them and they were good then, maybe I did something when I changed over to XT90’s.

gigaplex

iTrader: (2)

With an appropriate wiring harness you can charge that low cell separately, but I wouldn't trust the pack. If it's been in that state for a while, there's already irreversible internal damage to the cell.

Brian C.

iTrader: (1)

You may be able to save it but I wouldn't trust it personally.
To dispose start by discharging and the home Depot and Lowes I heard take them

the rc guy

you can try to make 1 of these then set charger on ni mode at a low amperage and give it a shot but watch the voltage.

Geezatec

I've done this on drone 4S lipos, it does work.

Connect lipo to charger, put it lipo blanket or ammo can for safety. Set charger to NiMh charge at lipo MAH. Set amps to .50amps(half amp). You dont want to force it, Every 15sec Start and Stop, and 15sec rest. #4 cell will incrrease. When it reaches 3.8V stop there. Be patient It take time! maybe 15-30min.

When reaches 3.8V, change charger to Balance Mode, set amp to MAH rated at, 4S Start Charger It should start charging. Check LI Batt Meter on charger and monitor Balancing charge And check temp on battery pack.

Respone to post if need questions.

gigaplex

iTrader: (2)

There's a good chance they'll overcharge the other cells if they aim to get the lower cell up to 3.8 with that method. Aiming for 3.0-3.2 should be sufficient to convince the charger to start balancing in lipo mode.

Geezatec

The theshold of voltage is 2.8volts on any lipo. New ESC shuts off 3.0-3.2v. Cuz most people on think about voltage too low. And manufactures of lipo has literature on Lipo battery pack. When you balance charge, you see that the cell waits yo catch up with the rest. at 2.8 volt it'll start charging, not error of Battery too low.

gigaplex

iTrader: (2)

I agree on 2.8V, but you said 3.8V in your post.

Geezatec

typo error, meant 3.2. just 2.8v your charger will operate.