YOU'VE BEEN WAITING ON THIS! Here is your spare battery for the hottest new Fenix flashlight, the PD36R 1600-Lumen Tactical Flashlight. The all-new ARB-L21-5000 Li-ion battery provides the voltage and power needed for extended runtime and higher lumen capacities. The ARB-L21 comes with all the bells and whistles of high-quality Fenix batteries, including protective circuits inside the anode and up to 500 charging cycles. Also included are the three sets of overheat protection: pressure relief, microporous, and PTC cathodal block. Don't run out of light; pick up a spare 21700 battery today!

NOTE: THIS BATTERY IS LARGER THAN AN 18650 BATTERY AND WILL NOT OPERATE AN 18650 PRODUCT.