aolithium lifepo4 battery problem. uneven voltage drop on no 4 cell

[geoaitken]

Aolithium 12v lifepo4 100ah battery - have purchased this battery from aolithium uk, have had problem from new with no 4 cell discharging at lot quicker than the rest of the cells, From fully charged to 57% discharge no 4 cell cutouts at 2.5v, cells 1,2, and 3 are sitting at 2.9v, Have reported this problem with no 4 cell to aolithium uk on 5 different occasions now, they say to fully charge the battery as this is normal with a new battery, I have fully charged this battery 9 times now and i am still getting the problem with no 4 cell discharging alot quicker than the rest of the cells and cutting out with around 50% state of discharge. Aolithium uk support seem to think that this is ok and the battery is not faulty, I strongly disagree, whats your thoughts or opinion ?

 

[MisterSandals]

11.44V is not 57%, more like 2-5%.
Your battery is virtually empty.

At that low SoC, cells will diverge like that normally. It would be nice if they didn’t but tiny capacity differences can look horrible with big voltage differences.

The question is why is your BMS SoC off by so much?