http://www.nikonchat.com/coolpix-l12-manual/

Why my camera battery run shortly after taking 15 photos fight?
Umm, I have a Nikon Coolpix L12 … the new version, I think. I originally used the Alkanine AA batteries that can be entered and after taking about 25 w photos with flash, my battery was "exhausted." After replacing the batteries with Engerizer Alkanine, (I think he used before, I found somewhere) my camera battery was low after taking about 15 photos without flash … this is ridiculous! The manual says the batteries should last 150 photos I am Alkanine!
It is using a lot of energy with each photo, plain and simple. There are some ways you can get more pictures of the batteries though. Try reducing the brightness of a few degrees and adjust timer weak to no more than 7 seconds. This way when you are standing talking to the camera are not you trying to expand on everything that your hand moves around. just use the flash, if you really need. If you're vacationing avoid night pictures unless you have a tripod and can extend the exposure time. The flash has a lot of power and is usually black with some specs white anyway. Only purchase alkaline batteries are made to go to electronic digital. Copper good ol 'tops that work for your flashlight arent going to work well in a digital camera. AA batteries recharge will help you get a little lace of them, but the load time and switching time and again not worth it. If recharged to try using a small piece of tape or an account with a pencil or marker so you know you were charged and only just pulled the camera. It also lets you know who have already loaded. After a couple of times around the Wold time at the shipper will not do any work. Familiarize yourself with shutter speeds and other settings of the camera. Use the form faster than speed while you can still get a quality picture. If manual focus is available to use instead of autofocus. Most cameras can approach to food, then turn and shoot. Think of when you turn the camera on and off and how long until your next photo. Commissioning up the camera requires a good deal of time and energy, but so does the power mode. Gage, the time between each application and decide whether to shut down or simply let sit idly in the energy saving mode.