I tried this method with the Verizon 2750 battery. It did not work well for me. When I would come back into my phone after wiping through CWM my phone would show 100% @ 4080-4130. I'm guessing cause of the reboots and everything else that takes place. I downloaded the Battery Calibration app from the market and it does not require a reboot. I wipes some file. I was showing 100% @ 4209. I'm still in the process of running my battery down before recharging. Its been over 40 hours and I still have over 35% left so tonight I will do my best to empty this thing. I'll let you know what it shows after I recharge it. Previously I had to bump charge it to get it where I needed it. Hopefully that problem is fixed.