Rechargeable battery Fenix 18650 with a capacity of 3400 mAh with protection.
The advantage of the Li-Ion battery is its high capacity, and in addition it almost does not suffer from self-discharge or memory effect.
The battery is equipped with protection against excessive discharge, short circuit, overheating and high current draw. If the electronic protection of the battery reaches its limit values, the cell is safely disconnected. Service life is more than 500 charging cycles.
Note: due to its length and diameter it may not fit some older models – for example Fenix PD31, TK11, TK21, TK30.