Opteka Battery Pack Grip / Vertical Shutter Release for Canon EOS 450D 500D 1000D T1i XSi XS Kiss F X2 X3 DSLR Digital Camera with 2 LP-E5 Batteries Built-in 2100 mAh battery effectively doubles your shooting time Vertical shutter release also makes shooting with the camera in a vertical position just as comfortable as shooting horizontal Increases functionality and convenience 1 Year warranty