Opteka BP-511 2000mAh Ultra High Capacity Li-ion Battery Pack with Premium Tech AC/DC Rapid Battery Charger for Canon EOS 5D, 10D, 20D, 30D, 40D, 50D Digital SLR Camera Memory free for maximum performance, Ultra high power, True 2000mAh, Lithium Ion 7.4v Extended shots - Up to 25% more State-of-the-art-components, Built-in safety fuse, Top graded and matched cells used exclusively Brand New, 2 Year performance warranty Includes Rapid travel charger