TTW

I just updated my A1 firmware to 2.01 and found very serious battery drain. Even using fully charge battery, the life quickly went down below 40% while I was reinstating my custom keys and custom shoot settings. I did not even take any shoot and the battery drained so much. Anyone also have this problem and any suggestion to resolve this problem? I tried both old and new batteries but same problem persist , which was not a problem before the firmware update.