3500 Rechargeable Battery

The Fenix 3500 Rechargeable Battery is a premium 18650 lithium-ion cell engineered for anglers, boaters, and outdoor enthusiasts who depend on reliable power for tactical lights, GPS units, and electronic gear in demanding marine environments. With a 3500mAh capacity, this next-generation battery delivers the runtime and performance needed for extended time on the water, whether you're night fishing, running electronics during dawn patrols, or powering backup equipment on multi-day trips.

Built with multiple layers of internal protection, the Fenix 3500 features integrated short-circuit prevention and intelligent thermal management—critical safeguards for use in wet, saltwater, and temperature-variable conditions on the deck. The button-top design ensures compatibility with a wide range of flashlights and devices while improving contact reliability and reducing corrosion risk. At 0.11 lbs and compact dimensions (0.7 x 0.5 x 2.7 inches), it fits seamlessly into tackle boxes, boat lockers, and emergency kits without taking up valuable space.

Boaters and professional anglers benefit most from the Fenix 3500's proven durability and rechargeability, which reduces dependency on disposable batteries and cuts operating costs on extended trips. It works with all standard 18650-compatible tactical flashlights, marine-grade headlamps, and backup power systems commonly found aboard fishing vessels and recreational boats. For anyone running night electronics or backup illumination in salt spray and humidity, this battery's protective engineering and high capacity make it the intelligent choice for reliable waterborne operation.