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Izzy, just let it run until it is dead a couple times, and that should get it to 100% accuracy.
necosino, along with this, should the battery stats be wiped in recovery? Will that in anyway assist in making the widget more accurate?

Hey neco, i just re-calibrated and can't seem to find the option to stop calibrating after it became 'accurate'. Has that option been removed? On 4th or 5th cycle and it is still calibrating, giving me a different total battery life all the time (not just different 'time till dead' reading)
Just go to the battery screen (where you select different batteries). Hit edit on the profile, and uncheck Calibrate.