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Power various electronics, including the Fenix PD25 and PD22UE flashlights, with this 16340 Rechargeable Lithium-Ion Battery from Fenix Flashlight. The cell features 3.7V of output power, a 700mAh capacity, and a 2.59Wh rating. It also has a built-in protection circuit that safeguards against short-circuiting, overheating, and excessive charge/discharge current. The overheating protection is achieved by way of a three-layer design consisting of a pressure relief valve, a microporous membrane separator, and a PTC cathode block. Additionally, the durable battery is designed to last for up to 500 charge/discharge cycles, and its low self-discharge rate allows it to maintain up to 75% of its capacity after the final cycle.