When you're down to the last notch on your battery, you can change the way you shoot to get more pics. Pump up the ISO as high as you can and, if you can get away with it, turn off the flash. If you've gotta have that extra flash light, move closer to your subject: The nearer you are, the less power it'll eat. While you're at it, switch to aperture-priority mode and set it as wide as possible -- that is, to lower f-numbers (bigger stops). Finally, turn off the LCD. Those extra precautions should buy you some extra shots.