The Canon BG-E14 Battery Grip is a battery grip for the Canon 70D camera. It provides extended battery life as well as a more ergonomical grip. Shooting with the BG-E14 makes shooting vertically more comfortable. You also get added controls, including a second shutter release button, main dial, multi-controller, AF point selection button, AE/FE lock button, AF start button, and a multi-function button.
You can use two LP-E6 batteries or six AA batteries to double the camera's battery life. You can also use the ACK-E6 AV Adapter if you need continuous power.