There are many makes available and it is not WikiAnswers' policy to recommend any one particular make. One person's opinion
The best rechargable lithium-ion cr-v3 battery is from Digipower, it is a perfect accessory for the avid photographer with digital cameras.
One can find more information about CRV3 batteries on websites like Wikipedia, Energizer, Panasonic, Farnell, Z Battery, Optic Planet, Maplin, Small Battery or Pentax Forums.
Yes each kind of battery generaly needs a different charger. A camera CRV3 cannot be charget in an AA charger.