DQ-RE3 Whether you"re at home or on-the-go, a long life camera battery will ensure that you have the power you need, when you need it. Features: -Lithium-ion rechargeable battery. -Smart technology communicates accurate information to the camerar. -No memory-effect. -Overcharge protection built in. Specifications: -Direct CANON replacement. -Provides 2000mAh of capacity. -Replaces the following CANON part numbers: NP-E3. -Fits the following CANON models: EOS 1D, EOS 1DS, EOS 1D MARK II, EOS 1DS MARK II EOS 1D MARK II N.