http://www.nikonchat.com/nikon-3100-battery/

I have a Nikon Coolpix 3100 digital camera and I need some information?
the battery seems to run out too fast and want to buy the battery Nikon CRV3, but I worry that the battery could run out too … Should I get a new digital camera? (It is only 3 years. Ussed of age and barely) any suggestions? Also, what are the memory cards?
i have that camera. my batteries do not have that problem, but I have two rotate. Maybe if you only have one battery is getting old. Do not recharge forever. Three years seems about the limit. Sitting around unused shortens battery life too. See the online manual – which gives tips for battery care. Memory cards keep your photos – film like. It is worth investing in a memory card of 256 MB. Nothing worse than being on vacation, and has only taken 12 photos and is out of memory! fun!
Nikon D3100 Digital SLR