The method I use would be as follows:-
1) Discharge your battery till your phone turns off.
2) Charge it for about 6 hours.
3) Go into Clockwork Recovery to clear battery stats.
Your battery should be close to what you expect it to be.
Sent from my Liberty using XDA
CyanogenMod 7.2 RC0 - 2.3.7 Gingerbread
Ramad's Deodexed JVB - Gingerbread
Crysis's Sensation 1.4.2 TW4
- Galaxy Tab 7
- Blackbery Bold 9780