3.7 volt, 850mah lithium ion battery with ultra compact size - only 6.7mm x 34mm x 48mm. 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). Ideal for pack builders - easily spot welded for terminal connection. CA005 - 41 in stock