Impressive battery life of 2007 Nov. version of MacBook

Sometimes it is relaxing to go back to non-technical subject.
I have used the base model of MacBook for a few months. Usually I don’t believe manufacturer’s claim on battery life. If they say that it lasts for 4 hours, the new battery will last about 2 hour and 30 minutes usually, and more realistically 2 hours. If you use that kind of notebook computer for about 1 year, it will be stabilized around 1 hour and 30 minutes.

However, somehow the MacBook has different story.
I charged my machine last sunday, and I turned it on today.
The remained battery level is as follows :

The natural discharging quality is very good. And it actually last more than 4 hours in actual use.

Is the battery really different from those used in Windows notebooks? Or is the Mac OS X power manager is really good?

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