Digital Camera Batteries
Although digital cameras and the camera batteries that power them have improved tremendously since they were first introduced, camera batteries can still tend to drain pretty quickly due to the power draining LCD screens, flashes and on board electronics.
Many digital cameras are powered by rechargeable AA batteries, although many cameras today use longer life lithium batteries. In either case, unless your digital camera manufacturer requires a specific brand of battery, it will pay to try several competing brands over time to see which delivers the best battery performance for you. The difference between battery brands may only be a few minutes of life or it could be substantial. If you're not using rechargeable batteries you'll go through tons of batteries over the life of your camera.
Rechargeable Camera Batteries
Two types of rechargeable camera batteries are available: NiCd (nickel cadmium) and NiMH (nickel-metal hydride). NiMH generally provide better camera performance and battery life.
If you want use rechargeable camera batteries, remember that they take time to charge. Additionally, if you fully charge a set of batteries and they then sit around for an extended period of time, when it comes time to fire up your digital camera you may find that the batteries have gone dead. That's why it's always best to have one or more sets of backup batteries in your camera case ready to go at a moment's notice.
Newer kinds of alkaline batteries like Energizer’s Advanced Formula and Duracell’s Ultra provide slightly better performance than older types of alkalines.