The Xtar 26650 is a powerful, high-capacity Li-ion battery made for heavy use in specialty electronics. This battery feature a 5200mAh capacity, outclassing competing batteries and keeping your devices powered up for extended periods of time. With 3.6 volt output, the Xtar 26650 is the ideal battery for various electronics, but especially high-output LED flashlights. The powerful chemistry of these Li-ion batteries is regulated with a high tech protection circuit that prevents them from being overcharged or over-discharged. With a lifespan of up to 500 charge cycles, the Xtar 26650 will also save you money, in the long run, thanks to its high-quality engineering.