I'm not sure if you are asking if you should make a camera with a built-in rechargable battery and recharger a priority in purchase, or if you are asking if you purchase a camera that takes AA's if you should then buy rechargable batteries?
For most consumer grade digitals, IMO stick to a camera with a standard battery if possible. Purchase NiMH rechargable batteries. Get a couple set's so you can have a fresh set ready to go.
For higher end camera's like most ANY DSLR, they are going to likely have a proprietary battery. My D1x does, the D70/D100/D2h (Nikon) do as well. There is no option with most DLSR's. Canon 1Ds/1DMarkII/1D/10D also use their own battery, not sure about the D300.
The batteries for the DSLR's are mostly great stuff. The D70 can get 1000+ shots in RAW mode on one charge based on LCD usage.
The consumer models that come with built in Propriatary batteries IMO should be a last choice. The batteries tend to be VERY expensive vs. a standard set of NiMH AA's or AAA's, and the batter life is generally no better than standard solutions. Also one may be forced to charge the battery in camera which makes the camera rather useless when one is charging the battery. If the charger goes bad, it's expensive to replace, and in fact may be a problem that results in the camera going into service for those camera's with built in charge systems. Some models charge using a base, which means one has to run around with a base to charge the dern thing.
IMO this is a major factor in digital camera purchase as a camera with dead batteries is useless, and forgetting a base, or the extra battery can really impact the ability to shoot at will.
With standard batteries, one can have a depleated set charging, and the camera remains in use with a fresh set. If the charger or battery goes south, just replace with the best thing available (or cheapest) at the time.
The new NiMH 2400 powerex cells are very good. Make sure you get a good charger as the battery charge, and life will be impacted by how well a charger charges and maintains the battery.
Hope this answers your question.
Ron
curiousgeorgie:
I'm an amateur photographer looking to buy a digital camera. If all other aspects are equal, is it better to have a camera with rechargeable or disposable batteries?