If you own a Fenix RC40 flashlight, you'll want to have a spare battery on hand in case your flashlight runs out of power. The ARB-L3-15600 Li-Ion battery boasts a voltage of up to 7.4V and a capacity of 7,800 mAh, which is roughly equivalent to two fully charged smartphone batteries.
Thanks to its unique design, you don't have to look for the plus and minus poles on the battery. You can insert it into the flashlight in any way you like.
The battery life is at least 500 charging cycles. At the same time, it does not suffer from memory effect either. You can therefore recharge it even after short periods of use. It has protection against overcharging, complete discharge and short circuit.