You have some control over how much power your camera draws. By following these tips, you can significantly increase the number of shots you get per battery set. Rule number one. Turn off the electronic viewfinder if you re not really using it. LCD screens are serious power hogs.
Most cameras have optical finders that are just like the ones found in film cameras.
Every second you work without the LCD is several more minutes of battery time for shooting. Rule number two. Limit flash use. Some people always shoot with a flash set for auto. That means it is charged and ready to fire, even outdoors when it is not needed.