Sorry - I'm a bit 'battery dumb.'
I'll tell you exactly what I did. I put the battery in the phone Sunday. Accidentally turned it on when doing that. Turned it off immediately and charged the phone to full.
Have been looking for a solution to poor battery life and at xda they recommeded installing battery monitor widget, which I did. One of the things this app does is read the battery's max capacity as determined by the OS - which is displaying as 1750 instead of 2200. It's like my phone doesn't recognize the additional capacity of the extended battery.
If there is somewhere to wipe battery stats or something I should've done, I'm not aware of it.