The Switronix SL-E6 Series 7 is a 7.4v, 1800mAh Lithium Ion battery pack which can charge on the Canon LC-E6. The SL-E6 battery also communicates with the EOS 5D Mark II and 7D digital cameras, allowing you to check the remaining capacity on the camera's power source info screen.
The Z-Finder EVF allows you to operate the DSLR camera with the correct form factor for video with the camera "in-line" to your rod system (the most stable way) and your eye in the Z-Finder EVF