DESC: The PowerBase 70 Battery Pack from Switronix contains a 70 Wh, 14.8V Lithium-ion battery designed to extend HD movie recording time for the Canon EOS 5D Mark II and 7D digital cameras. The PowerBase 70 delivers six times more power than the original battery supplied with the camera. It is also intended to streamline your High Definition (HD) movie recording: the PowerBase 70 mounts under the camera and doubles as a grip or can be attached to an HDSLR support via its 1/4"-20 release plate or V-Mt mount.Wired as a 14.8v battery pack, it can provide extended power for up to two additional 12VDC devices such as lights, monitors or HD converters as well as other devices requiring lower voltage (an optional XP power regulation cable is needed). The pack is also furnished with 1/4"-20 threads on either side to mount accessories.