ATC 2X Canon BP-511 Battery 7.4V 1400mAh Gray + Canon BG-E2N Battery Grip with IR Remote For Canon EOS-20D EOS-40D EOS-30D EOS-50D Same functions with the original grip Canon EOS-50D All the specifications above are based on CIPA testing standards It can hold one or two LP-E5 rechargeable battery or 6 AA batteries This professional Grip includes Vertical-grip main dial ,shutter release button,multi selector It is very useful for taking group and long exposures shooting easier and away from the camera