So I just bought a Samsung S600, which takes remarkably good pictures and was surprisingly cheap. The only issue is, the battery life is like 3 hours, and AAs aren’t cheap.
It has no slot for a lithium ion battery. So, what should I buy? More duracell AAs? Rechargables? Or is there a better alternative?
Get some 2500+ mAh rechargables, they tend to do the job.
Something like this should get the job done - shopping.pchome.com.tw/battery/d … d=BAC00185
Seems like you can get 2700mAh ones as well - shopping.pchome.com.tw/imageb/de … d=AZU00050
The higher the better really for a digital camera, also make sure you get a 1h or faster charger for when you need that extra power quickly 
got some sony 2500, they work great with cameras. try to avoid crappy brands.
got some sony 2500, they work great with cameras. try to avoid crappy brands.[/quote]
Totally agree. Buy named brand batteries from Japan and they should recharge and discharge very efficiently.