I just purchased 2 "SOK LiFePO4 12v batteries", one of them after opening the box came with a charge of 7.9v the other came 12.9v. Haven't been used at all. What's the minimum safe discharge for this kind of battery? Should I be worried about the one that came at 7.9v? I am not very experienced with batteries, I assumed they should come new at a very close voltage to be ready to be connected in series. I am not sure if I should return it or buy a 12v charger.
Electronic – Whats the minimum discharge for a 12v LiFePO4 Battery
batterieslifepo4
Best Answer
Opinions on maximum discharge vary, but I would not discharge beyond 2.8V per cell (as always, it's a capacity/cycle life trade-off, but LiFePO4 batteries have a very flat discharge curve at about 3.2V per cell and will only start dropping just before they are empty).
At 2.5V per cell, they are definitely empty; at 2V per cell or below, they may be damaged. There are 4 cells in your battery, BTW.
Even though it may be recoverable, I would return it as a DOA.