Rechargeable NiMH AA size batteries generally tend to be pretty bad at lasting the course, especially from experience of using some well known high-street brands such as ENERGIZER (formally Eveready) and Duracell. Unlike Li-ion batteries they generally tend to suffer from the milk bottle effect of not being able to fully charge like when they were new through irregular patterns of charging. They were pretty much useless after a 10 or 20 charge cycles over a few months. 

Fortunately though the likes of Sanyo have been on it for some time now. It's no secret amongst serious camera users needing high capacity AA's (at least I thought it wasn't) that they produce some of the best rechargeable NIMH double and triple A batteries on the market via their ENELOOP range. Why? 'Cos the their 2000mAh capcity AA's batteries are certified to have a charge cycle count of approximately 1500 (under optimum recommended conditions of usage) and they're capable of retaining their charge even after a year without use of up-to 85% of their original capacity. They also reckon that in the third year they'll still be able to operate at 75% of original capacity where as most other brands will be completely dead by the second year, but whether that's true or I can't confirm quite just yet.

They also produce a higher capacity 2500mAh with a certified 500 charge cycles count(again under optimum recommended conditions of usage).


I ended buying some 1000mAh ENELOOP Lite batteries for use with a flash (rated as having a 2000 charge cycle count), but no doubt that if you're looking to use them with a camera you might want to consider the 2000mAh version so can go for longer between charges.

UPDATE - verdict after testing

Eneloop lite 1000mAh ni-mh batteries

I've had them long enough to figure out that these 1000mAh capacity ni-mh batteries don't last very long with compacts camera's, that's even without using the flash. They went for around about 30 snaps as a two cell battery over the space of a couple of days when used with a Polaroid compact (even less when tested with a powershot SX150). A large chunk of the drain was probably caused by the constant auto focus system. Generally they were more useful for a 4 cell flash gun I had, which the eneloops were good for around about 45 to 55 cycles (gradually getting much longer to re-cycle once I got passed 30). So evidently much better as a four cell battery in a flash gun.

Summary

Not really that great for compacts. Much better than expected for the four cell battery flash gun I was testing it on. You might be better going with the heavy duty 1500 charge cycle eneloops or the newer gen 2000 charge cycle eneloops.