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One cell deviate after few cycle

sharkut
in Batteries

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I have a DIY 16s prismatic battery of 200Ah from GFITT ith Daly BMS 250A

When I charge and balance my pack. I reach 0.005V deviation @3,625V but after a few cycle one cell (the one just before the positive global pack connector)

deviate (see picture). the 15 others almost no deviation. Just this one....

The stranger thing is when I reach 48V (my bottom) It's not the most discharged of the pack.

Why? bad battery connection ? Bad cell ? High internal resistance for this one ?

 

Thanks

 

PS : I know 3,625V is quite high I only use that to rebalance battery pack , but I use 55,2V for bulk on 53,6V for float in normal time

 

 

batt.png

Edited by sharkut

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