Galaxy Note 2 battery drain after Android 4.3 upgrade

My Galaxy Note 2 was recently upgraded to JB 4.3 from a very old JB 4.1. To my horror, I saw my battery was draining like crazy and charger can not keep up with the drain when wifi is on. Initially I thought it is misbehaving app perhaps and therefor did a factory reset. That did not solve the problem. Went back to google and found out there may be a solution by enabling "developer mode". To achieve this small feat you need to click on your device properties and tap on 10 times (you read that right, so intuitive) on base band information. After that, everything seems normal now.