Cameras use one or more of several types of batteries: AAs, either nonrechargeable alkaline ($5 for four) or rechargeable nickel metal hydride (NiMH, about $14 for four); high-capacity disposable CRV3s (around $10 apiece, and some cameras take two); or proprietary rechargeable batteries that can cost $25 to $65 to replace.

Some digital cameras quickly drain batteries--especially alkaline batteries--which can be expensive and annoying. Battery life and cost often aren't related; some inexpensive cameras have great battery life, and some expensive ones use up a charge quickly. Either way, it's a good idea to buy spare batteries.

The majority of today's cameras can capture video as well as still shots, and some even record 1080p high-definition video. If you plan on shooting a lot of video with your camera, here are some things to consider: