Wasabi Power Battery for Canon BP-511, BP-511A, BP-512, BP-514 | St. Cloud Camera & Photo
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
Kastar 4-Pack BP-511 Battery and LCD AC Charger Compatible with Canon EOS 5D, EOS 10D, EOS 20D, EOS 20Da, EOS 30D, PV130, EOS Rebel DS6041, EOS 40D, EOS 50D, EOS 300D, EOS
2X BP-511 BP-511A Battery for Canon EOS 5D MK 1 10D 20D 30D 40D 50D D60 D30 300D | eBay
Canon Battery Grip BG-E4 (BP511, BP-511A) at KEH Camera