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OEM Canon BG-E7 Canon Battery Grasp for EOS 7D.
The BG-E7 is a battery grasp designed specifically for the Canon EOS 7D, allowing you to use 1 or 2 LP-E6 electric battery packs.
With two packs, the currently excellent battery life is increased.
The BG-E7 supplies complete vertical shooting controls, which could be separately transformed on or off as the digital photographer has to boost cam handling, specifically for shooting upright photos.