The Canon LP-E4 Battery Pack is the power source for the Canon EOS 1D Mark IV DSLR Canon EOS 1D Mark III DSLR and Canon EOS 1Ds Mark III DSLR. The LP-E4 is a rather small battery when compared to the prior 1-Series body's NiCAD power source as seen compared below.
The LP-E4 Li-ION battery delivers a huge number of frames (approaching 2,000) from a single charge.
I always have a spare battery on hand, but with this many frames from a single charge, it is harder to justify having the extra battery.
Recommended Shopping Resources (Using these links to make your purchase supports this site)
Canon LP-E4 Battery Pack at B&H Photo
Canon LP-E4 Battery Pack at Adorama
Canon LP-E4 Battery Pack at Amazon.com
Canon LP-E4 Battery Pack at J&R
Find the best price on the Canon LP-E4 Battery Pack
