Disappointed in Number of pictures taken with Nikon D5100

[WayneF]

Battery life is more about how long the rear LCD was illuminated, and how much the internal flash was used, more so than about how many pictures were taken.

If you spend much time with the rear LCD on, you are draining your battery rapidly. Just leaving the camera turned on is about nothing, hardly any effect. But if the rear LCD is on, huge effect.