Model BK063450AR. 3.7 volt, 850mah lithium ion battery with ultra compact size - only 6mm x 34mm x 50mm. Highest quality - designed for use in cell phone packs, data acquisition applications, etc. These units are aluminum encased and feature a high power/weight ratio, making them exceptional for use in electric vehicle propulsion systems, prototypes, etc. Also excellent for use in RC projects and in solar back up power applications. As with all lithium ion packs, protective charge/discharge circuit is required (not supplied). TS086 - 1 in stock