The pictures remain on the memory card. Even if battery power weakens, no picture loss is to be feared with most of today's cameras. However, just as you are recommended not to store important data on diskettes, you should also ensure your irreplaceable images are saved on your computer's hard drive. This can easily be done with the help of the battery gauge, a standard component in every good digital camera. If your digital camera has a date and time indicator, you need not worry about losing this information after changing the battery.
Most digital cameras contain an energy buffer that safeguards against memory deletion.
Digital cameras do not require any special servicing. You should, of course, take care of your digital camera just as you would any other electronic instrument. That includes removing the battery from the camera if not in use for a long period of time and storing your camera in a dry environment. The more photos you take, the faster battery power is used up. If you use your digital camera quite frequently, you should always choose high-performance batteries such as alkaline or NIMH batteries .