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I'm very specific about the time my laptop battery can last as it is very important to me. Will my laptop's battery last longer with Windows 8 or Windows 7, both in similar power plans, considering factors such that Aero is disabled in Windows 8 and many others?

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There is a slight improvement just as microsoft says. You might end up with 10 minutes of extra juice or half an hour , a lot depends on the condition of your battery too. Your battery was younger when running windows 7 ;) –  Shekhar Oct 27 '12 at 8:35

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up vote 7 down vote accepted

There have been some comparison in the battery life between Windows 8 and Windows 7. Very early tests in the preview showed no improvement, but the latest benchmarks appear to show slight improvement.

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You should be aware that battery life will depend on your actual hardware, drivers used, and settings (screen brightness, etc).

The programs installed will also be a factor, for example, the following shows how it can change:

enter image description here

Note: the above comparisons are based on specific hardware, and the setup used for the tests may differ from yours

Sources:

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I think we'll see some improvements when the next generation of chipsets/CPUs come out that Windows 8 will be able to make us off and Windows 7 can't. –  Ivo Flipse Oct 27 '12 at 9:15

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