The Watson NP-E3 NiMH Battery Pack works with the same cameras as the Canon NP-E3. This replacement battery pack features a capacity of 2000mAh, 12V of output power and 24 watt-hours.
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This is a great battery pack. I have one of these Canon EOS one Mark II. I had this camera when it was new as sold it to upgrade to the newer every time one came out. I had the opportunity to pick up a new old stock Canon EOS one Mark II. And I while the original battery still worked it was getting old. I got one of these Watson batteries. I did a lot of research and found that this is the best one for my camera as the original ones from Canon or no longer sold and the camera is still a fantastic camera to use. Mine fit on the camera perfectly. The only thing I changed was if you undo the two screws you can use your original cap as it seems a little sturdier. This can be swapped out and under 30 seconds if you're looking for a battery for your older Canon camera, you can't go wrong. The battery last a very long time much longer than the original as I remember I'm sure due to updated cells in newer technology breathe new life into this wonderful vintage camera.
I'm really happy somebody still makes batteries for 20+ years old camera, but as people previously mentioned, the fit is not perfect. I followed an advice from the reviews and chanched the cap with the original battery: no rocket science, just open two little screws and the cap comes apart. Now it looks and fits perfectly.