I have a 7P20S battery with 140 cells and 3 of 20 of the series are not charging fully- it is about 9 months old and only done say 30 cycles. I am using a Adaptto Max-E Controller and BMS.
17 the cells are very close to 4.16V. I have 3 that are low, 3.53, 3.7 and 3.8. these are on 3 different bms boards- all in position 2.
This severely limits the range of the bike since the BMS starts shutting down when the the lowest cell hits minimum- usually when the pack is showing over 80%:-((
I can't really believe I have bad cells in this pack already. Anyone have any ideas what i can try to re-balance this pack?
thanks in advance.