2CR5 battery

2CR5 compared to a AA battery image by Studioesper (Image rights)

A 2CR5 sized battery pack contains 6v of power and uses lithium chemistry. Similar to CR-P2 battery, it is usually manufactured by using two 3v CR123A battery packaged together. Because of the shape, it is primary installed in the right hand grip area of cameras. It is most commonly used in Canon EOS line of cameras, but is also used in many digital cameras.