The BG-E1 holds 2 Battery Packs (BP-511 or BP-512) to offer double-length shooting time. The vertical shutter release also makes shooting with the camera in a vertical position just as comfortable as shooting horizontally.

Features:

Accepts up to two BP-511 or BP-512 Batteries
Vertical shutter release makes vertical shooting just as comfortable as shooting horizontally
Offer double-length shooting time with two batteries
Battery grip for Digital Rebel