There have been times where I too thought my battery life was quite poor, but quickly see that 2 or 3 hours had passed since I started testing a new build. Moving in and out of LiveView, pulling rack focus multiple times, watching a timelapse or two in camera or an HDR video shot at 24fps or 60fps, investigating difference in ISO configs, or spending lot's of time working with FPS override, then all of a sudden; dead battery. But it wasn't all of a sudden, some times I have to remind myself that the battery I'm using was also used the day before for an unknown duration.
What I find when I'm in the field working is that I am often able to use a battery all day, and this is while using autofocus (occasionally), shooting raw (upwards of 500 photos captured), record between 8 and 15 minutes of video (some of it HDR), plus all of the false shots where I pull focus, adjust aperture, skip the shot, and then leave the camera to auto-power down in 1 minute.
It would be great if some other users tested their batteries as A1ex has and post the results here so we can move beyond the anecdotal complaints that ML eats batteries, or confirm the cases where it does.