The specifications for the FZ43 are approximately 120 photos at the highest resolution however this depends on how many times you power the camera on/off, zoom in/out and toggle between taking photos and videos.
Remember, the battery is not only used to take photos, but is used to operate the camera which includes all of its features and functions like the lens motor, etc. We have customers that take hundreds of photos with a set of new AA batteries, it really is based on individual use.