If you own a Fenix RC40 flashlight, a spare battery pack will definitely come in handy, so you always have one ready in case your light runs out of power. The Li-Ion battery labeled ARB-L3-15600 boasts a voltage of up to 7.4 V and a capacity of 7,800 mAh, which corresponds roughly to two fully charged smartphone batteries.
Thanks to its unique design, you don’t need to look for the positive and negative poles on the battery. You can insert it into the flashlight in any orientation.
The battery life is at least 500 charging cycles. At the same time, it does not suffer from memory effect, so you can recharge it even after short periods of use. It is protected against overcharging, total discharge, and short circuit.