hello, this maybe a silly and simple question but i just received my king kong inr 26650’s 4000mah 3.7v batteries, and before i charge them, there is a selector switch on my trustfire tr 006 charger that reads 4.2v or 3.0v. which mode do i need to put it at to charge my batteries?
No, a 3.6V LiFePO4 cell is pretty much depleted at 3.0V (maybe 5% capacity left). You really can’t tell their remaining capacity from the voltage from 3.3 to 3.1V since the discharge curve is so flat. 80% of the capacity curve sits around 3.2V