All the 1-series digitals use the same battery pack, the NP-E3 12v NiMh. A new one needs a few charge-discharge cycles before it reaches optimum capacity, but there's no reason you can't do the bulk of that in-camera. I run the battery down in the camera, and then refresh when I put the battery on the charger. The refresh goes a lot faster and you get to use most of the charge in the camera.