With the advent of digital photography, we are no longer shackled by the ’36 exposure’ limit which plagued the film. However with digital though one is bound by another limit, that of a battery. If the battery of your camera discharges completely you can’t do much than stop shooting. And this has the canny ability of happening at the most unfortunate of moment. So in order you do not lose the shot, be prepared. Take serious heed of the things I put forth & you’ll never run out of battery charge.