Was the biggest driving force for me to do my first root a couple years back, lucky for me it was a very painless procedure. I found that if you delete the /data/system/batterystats.bin, reboot, then follow the bump charge procedure a few times it would get your full life back. It even talked about doing the bump procedure (didn't call it that, but that is what it is) in the user sheet that came in the phone.
Note, you should only need to do the drain and bump procedure a few times to get it back up on par with the rest of us. I can play games + surf on my stock one for many hours before I even have to think about looking at the battery.
(FYI, this has been known to get people in trouble when they flash ROM's too since you need to go through this every time you flash (well unless it is a test run, then you should be OK)
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