Fenix Rechargeable Batteries
High-capacity lithium-ion cells built for the demands of high-drain LED flashlights and headlamps. The most common sizes are 18650 and 21700, which power the majority of Fenix handheld lights.
Sizes and capacities
Fenix also offers 16340, 14500, and specialty cells for smaller models. Key specs are capacity in milliamp-hours (mAh) for runtime, discharge rate for high-output performance, and whether the cell includes built-in USB-C charging or requires an external charger. All Fenix batteries include protection circuits to prevent over-discharge and short circuits.
Why manufacturer-matched matters
Using manufacturer-matched batteries ensures your flashlight delivers rated output and runtime. Mismatched or counterfeit cells can damage the light, reduce output, or fail early. If you use your lights daily, keeping one or two spare cells fully charged is the easiest way to guarantee uninterrupted runtime. For charging, see our smart chargers page.
Fenix ARB-L21-6000B
6000mAh Li-ion USB-C Rechargeable Battery
The Fenix ARB-L21-6000B is a 21700 6000mAh Li-ion rechargeable battery with a built-in USB-C charging port — top it off without a separate charger. It also functions as a power bank for phones and sma... To learn more about this product, please click here >>>
Fenix ARB-L21-6000
21700 6000mAh Li-ion Rechargeable Battery
The Fenix ARB-L21-6000 is a 21700 6000mAh Li-ion rechargeable battery rated for 10A continuous discharge, with multiple protection circuits and pressure relief vents — built for high-current tactical ... To learn more about this product, please click here >>>
Fenix ARB-L21-5000 V2.0
21700 5000mAh Li-ion Rechargeable Battery
The Fenix ARB-L21-5000 V2.0 is an updated 21700 5000mAh Li-ion rechargeable cell with integrated protection circuitry and pressure relief vents for high-current operation. The 70.5mm length fits stand... To learn more about this product, please click here >>>
Fenix ARB-L21-5000U
21700 5000mAh Li-ion USB Rechargeable Battery
The Fenix ARB-L21-5000U is a 21700 5000mAh Li-ion rechargeable battery with a built-in USB-C charging port — recharge directly from a phone cable, no separate charger required. Roughly twice the capac... To learn more about this product, please click here >>>
Fenix ARB-L18-4000
18650 4000mAh Li-ion Rechargeable Battery
The Fenix ARB-L18-4000 is a high-capacity 18650 4000mAh Li-ion rechargeable battery with 7A continuous discharge, protection circuitry, and pressure relief vents. Maintains performance through 500 cha... To learn more about this product, please click here >>>
Fenix ARB-L18-4000U
18650 4000mAh Li-ion USB-CRechargeable Battery
The Fenix ARB-L18-4000U is a high-capacity 18650 4000mAh Li-ion rechargeable battery with a built-in USB-C charging port — top off in the field without a separate charger. Stable 7A discharge handles ... To learn more about this product, please click here >>>
Fenix ARB-L18-3500U
18650 3500mAh Li-ion USB Rechargeable Battery
The Fenix ARB-L18-3500U is an 18650 3500mAh Li-ion rechargeable battery with a built-in micro-USB charging port — direct charging without a separate dock for field use. Integrated protection circuit g... To learn more about this product, please click here >>>
Fenix ARB-L18-1100
Rechargeable 18350 Li-Ion Battery
The Fenix ARB-L18-1100 is an 18350 1100mAh Li-ion rechargeable battery rated for 7A continuous discharge — built for compact high-output Fenix lights that need short-format power. Integrated protectio... To learn more about this product, please click here >>>
Fenix ARB-L18-1600
Rechargeable 18350 Li-Ion Battery
The Fenix ARB-L18-1600 is an 18350 1600mAh Li-ion rechargeable battery — a higher-capacity drop-in replacement for the ARB-L18-1100, compatible with Fenix hosts like the PD26R ACE, HM53R, and HM55R. A... To learn more about this product, please click here >>>
Fenix ARB-L16-800UP
16340 800mAh Li-ion USB-C Rechargeable Battery
The Fenix ARB-L16-800UP is a 16340 800mAh Li-ion rechargeable battery rated for heavy-load discharge, with a built-in USB-C charging port and a steel shell for impact resistance. Multi-stage protectio... To learn more about this product, please click here >>>
Fenix ARB-L14-1600U2
1600mAh Li-ion USB Rechargeable Battery for LD22 V2.0
The Fenix ARB-L14-1600U2 is a 14500-format 1600mAh Li-ion rechargeable battery with a built-in USB charging port, designed for the Fenix LD22 V2.0 and other compatible AA-format Fenix lights. Heavy-lo... To learn more about this product, please click here >>>
Fenix ARB-L40-12000
LR80R Li-ion Rechargeable Battery/Body
The Fenix ARB-L40-12000 is the proprietary 12,000mAh Li-ion battery body for the Fenix LR80R search light — not just a cell but the structural battery pack that integrates with the LR80R's modular des... To learn more about this product, please click here >>>
Fenix ARB-L56-4000
LR60R Li-ion Rechargeable Battery
The Fenix ARB-L56-4000 is the proprietary 4,000mAh / 14.4V Li-ion battery pack for the Fenix LR60R search light. The 14.4V output supports the LR60R's high-power LED draw, and triple over-heat protect... To learn more about this product, please click here >>>
