Amazon.com : Powerextra 2 Pack Replacement BP-511 Battery for Canon BP-511A and 5D 50D 40D 20D 30D 10D Digital Rebel 1D D60 300D D30 Kiss Powershot G5 Pro 1 G2 G3 G6
Amazon.com : FirstPower BP-511 BP-511a Battery 2-Pack 2200mAh and Dual USB Charger for Canon EOS 5D 10D 20D 20Da 30D 40D 50D 300D D30 D60 and More Camera : Electronics