LOT 2 x Battery 3800mAh Rechargeable BRC 18650 3.7V Li-ion for Flashlights (CREE LED FA-0515) (Electronics)
I think I have already given my opinion, good product, works well equipped to mitigate the fatal discharge voltage below a certain value for Lithium.Autour accumulators 2'2 volts, I think. The use in series, unprotected storage is strongly discourage