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diy solar

4S battery issues

Birdman3131

New Member
Joined
Aug 4, 2021
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3
Not sure where my issue lies. Coworker put together a 4s life4po battery pack. Using these batteries, this bms (The actual bms does say lifepo) and this charger.



is what it is doing but one cell is wack.


IMG_20210805_151103.jpg

This is what happened when I disconnected the charger. That same battery went lower than the rest. (The yellow numbers at the top show the 2 green traces for channel 7 (Pink one)

We currently have it unhooked but this seems fishy as I would expect the bms to shut down with that high of a cell voltage.
 
The pack may not be balanced, hook them all in parallel and charge to max spec voltage. Let rest, and try again.
 
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