Digipower PGR-CXT Rechargeable Lithium-Ion Battery Pack & Grip for Canon Rebel XT & Xti. More than double the power and shooting capacity of your digital SLR camera. Built-In rechargeable lithium battery. Up to 2500 pictures per charge. Up to 5X more battery power. Rechargeable up to 500 times. Retains tripod mounting thread. The battery pack is high capacity Lithium Battery pack, only designed for Nikon D80 camera. Equipped with one alternate shutter-release button. AE-L/AF-L Button and The Command Dials uses for taking photgraphs in vertical (portrait) orientation.