Canon LP-E6 Battery Pack for 5D Mark II

The LP-E6 lithium-ion battery pack is approximately 30% more powerful than the previous BP-511A Ð with 1800 milliamp-hours capacity, vs. 1390 mAh for the previous-generation BP-511A.
Even though the new EOS 5D Mark II is a substantially higher-resolution camera than the previous EOS 5D, and in spite of the added performance of its DIGIC 4 processor, the LP-E6 powers the camera for 850 shots at normal temperatures (vs. 800 for the EOS 5D), based on CIPA-compliant tests performed at Canon Inc.