Canon BG-E5 Battery Grip for Canon XSi Digital SLR Cameras (Reta

The Canon BG-E5 Vertical Grip/Battery Holder holds up to 2 LP-E5 battery packs simultaneously to effectively double your shooting power, plus the grip includes a holder to use six AA batteries. In addition, the grip includes a vertical shutter release and a mode wheel to provide access to all of the camera functions and make shooting with the camera in a vertical position just as comfortable as shooting horizontally.