I think my sister has a FujiFilm FinePix AB20, if that means anything, and it runs on a couple of AA batteries. Is there something that she can get it to switch to lithium instead of using alkaline? A plug-in kind of thing? Just saw my typo. I wanted to say "rechargable lithium battery." Li-ion batteries are not yet made in AA battery size.
The best you can do is to buy some NiMH AA's with at least a 2500 mA-h rating.
All compact digital cameras are optimized for using these batteries ... and perform poorly using standard non-rechargeable AA's | 