Your camera is heavily reliant on battery power. Your shots will depend on such power to take shots, view them on the LCD screen (if you have one) and transfer them to the memory card and thereafter to the computer. The use of flash, the optical zoom or working in extremes of weather will use up even more precious battery resources. Constant reviewing of yor images after you take them represents a further strain.

It is imperative that you keep your batteries in good shape. Here