top balancing with one cell at a much higher SOC

mk8intransit

New Member
Joined
Jun 25, 2021
Messages
2
Hi All,

Building a 4s 280ah pack for a friend, of the 4 cells 3 are reported by vendor as being at around 5% SOC (cell voltage around 3.2v). The other cell has been used in another demo pack and is reportedly around 30% SOC (showing approx 3.3v)

Any issue with just wacking these in parallel and charging to 3.6? (will be using a 10a CV/CC bench supply so it will take some time!, and I'm guessing will have a chance to balance out across the cells)

Or should I bring the 3 lower SOC cells up to approx 30% before putting in parallel?

Might be over thinking! but wanted a second opinion.

Thanks

L
 

Bob B

Photon Sorcerer
Joined
Sep 21, 2019
Messages
3,809
Probably going to be OK putting them together ..... but, I usually fail on the side of being more cautious. I'd bring them pretty close before connecting.
 
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