The Fenix ARB-L is a high-quality 18650 rechargeable Button Top Li-ion battery which is specially designed for the high-intensity flashlights. Featuring the large capacity, outstanding performance, great reliability and compact design, it is your best choice in various rechargeable Li-ion batteries. Features · 3500mAh large-capacity battery with outstanding performance · The battery has triple over-heat protection, safe and reliable · Built-in over-charge, over-discharge protection circuit, ensures the max performance of the battery · The circuit board has front and back protections, impact-resistant - more reliable