Are you running your Windows 7 (or Server 2008 R2) on a laptop or in any battery enabled machine? Try this one out, its Windows 7’s version of the command line powercfg. It has a new switch called /energy.
What this does is gives you your Power Efficiency Diagnostics (with an HTML report). You have to be a member of the power users or administrators group to do this. It would give you a very granular detail on your power consumption, how to maximize your power efficiency and for my reason of doing this, to give my laptop more battery life!
If you are also running hyper-v this is a neat tool for you to compute how much you are saving by running virtual and not physical machines. 😀
here is my report, the highlighted is the design capacity which means it has been designed to be 48 Watt Hours but now my full charge is only at 42 😦
I would ask the technician if I have to replace my battery now or is this an acceptable factory value. Now I now that I need to configure most power management options in my machine, maybe that’s why I can only run it 3 hours max on battery.