Windows 7 Boot Camp (Battery Issue)

I've noticed that my MacBook Pro 17" (10.6.7 - Early 2011) it's losing battery under heavy use on my graphic card, even plugged in.
With 100% of battery, after 1 or 2 hours of heavy processing, even plugged on energy, I get about 90% of the battery.
This happens only with Windows 7 on Boot Camp. Mac OS X has no issue regarding battery.
Is this supposed to happen?

That sounds normal. Macs running windows tend to have shorter battery life because windows is not set up to use energy savings like OS X is. You can adjust the settings in control panel but I'm not sure how beneficial that would be. I also heard that Macbook Pros graphic switching capabilities are not usable in windows as the drivers are not done for it.

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