The Fenix ARB-L18-3400 is a high-capacity, protected 18650 lithium-ion battery designed for high-performance flashlights and compatible electronic devices. Engineered for reliability and safety, it features an advanced protection circuit built into the anode to prevent overcharging, discharging, and short circuits. It also includes a pressure relief vent to ensure safe operation. With a long-lasting 3400 mAh capacity and a rating of up to 500 charge cycles, this battery provides a dependable power source for your professional and outdoor lighting needs.