The Canon NP-E3 rechargeable Li-Ion battery pack is designed for exclusive use with EOS-1D series cameras. It has a rated voltage of 12V and a rated capacity of 1,650mAh, higher than the previous NP-E2.
Compatible with the following Canon DSLR cameras: EOS-1D MkII / 1D MkII N / 1Ds / 1Ds MkII
It can be recharged using the NP-E2's current charger - the NC-E2 - and recharges in about 120 minutes.
The seams that come into contact with the EOS-1D series are lined with silicon rubber packing to enhance water and dust resistance.