This video might be helpful..
Galaxy Note 2 Tips & Tricks Episode 78: Battery Drain Issues After 4.1.2, Wifi On During Sleep? - YouTube
This guy has tons of helpful YouTube vids for the GN2. He says the battery drain may be due to a change in wi-fi setting after the update. I just followed his suggestion... we'll see if it helps.
Galaxy Note 2 Tips & Tricks Episode 78: Battery Drain Issues After 4.1.2, Wifi On During Sleep? - YouTube
This guy has tons of helpful YouTube vids for the GN2. He says the battery drain may be due to a change in wi-fi setting after the update. I just followed his suggestion... we'll see if it helps.