FENIX ARB-L18-3500U Protected Button-Top USB Rechargeable 18650 Battery

Fenix ARB-L18-3500U 18650 Battery

The Fenix 3500U 18650 is an incredibly unique battery, designed with a built-in USB charging port. Skip the battery charger, this battery can be directly charged using a standard micro-USB charging cable (sold separately). Designed to power high drain devices such as flashlights, lanterns, headlamps, and bike lights, this battery has a button-top and works in the majority of button-top compatible devices.