BG-E18 can be battery box and handle as well, supports holding two LP-E17 batteries. The battery box and the handle is also provided with a vertical shoot handle shutter button, the main dial and so on, so that you are in the same operation way in shooting and vertical shooting. If only using a single battery, can be mounted to the right or left, if the two batteries are installed, two batteries power supply at the same time. If camera is not used for a long time, please remove the battery from the battery box and the handle.