Fenix ARB-L21-5000 V2 rechargeable 21700 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!
THIS BATTERY IS NOT AN 18650, AND IT IS NOT COMPATIBLE WITH 18650 FLASHLIGHTS OR OLDER-STYLE CHARGERS (such as the ARE-C1 and other "C Series" chargers). COMPATIBLE CHARGERS ARE THE ARE-A2, ARE-A4, ARE-D1, OR ARE-D2. This is not the version of the battery with direct USB charging.
 
500 Recharge Cycles
5000 mAh Capacity
Lithium-ion rechargeable
Multiple Layers of protection
Pressure Relief Valve Protection
Separate Microporous Protection
PTC Cathodal Protection Protection Circuits in the anode
Overcharge, Over-discharge, Short Circuit, and Overheat Protection
7.5a Maximum current
Steel Shell Riveting
3.6V Charging Current: 1A recommended, 5A Maximum
Note: Does not include an on-board USB port for direct charging
Size
Weight: 2.56 Ounces
Length: 2.99 inches
Diameter: 0.85 inches