Backwards compatibility
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Backwards compatibility

As well as offering familiar ergonomics, the camera offers a good degree of backwards compatibility. For example, the Mark II uses a new battery, the LP-E19 but is still able to make use of the LP-E4 batteries used by its predecessor. 

This means that any professionals who've built up a collection of LP-E4 batteries with their previous cameras. However, the difference between the two isn't simply a matter of capacity: reverting to the older packs will see the maximum continuous shooting rate from from 14 fps (with 16 fps in live view) back to the 12/14 fps rate offered by the original 1D X. The new battery also offers an impressive figure of 1210 shots on one charge, according to CIPA standards.