Fenix Flashlights ARB-L2S 18650, 3400 mAh Battery, Black 3400 mAh large-capacity battery with outstanding performance The battery has triple over-heat protect for safety and reliability Built in over-charge, over-discharge protection circuit to ensure the maximum performance of the bat The circuit board has front and back protections to make it more impact-resistant and reliable Compact design, suitable for high-intensity flashlights