The Canon BG-E6 Battery Grip is a professional vertical grip accessory designed specifically for the Canon EOS 5D Mark II DSLR camera. It accepts up to two LP-E6 battery packs (or six AA batteries via the included BGM-E6 battery magazine), effectively doubling your shooting time compared to a single in-camera battery. The grip features full vertical controls including a dedicated shutter release button, main dial, autofocus point selection, AF/FE lock, and power button, making portrait orientation shooting as comfortable and intuitive as horizontal shooting. This accessory is essential for photographers who shoot extensively in vertical format or require extended battery life during long sessions. The compact black plastic construction adds minimal bulk while providing enhanced grip security and stability, particularly when using heavy lenses.