I had battery issues when i jumped to 246 via HoB. Played with smart actions, found it helped a lot, but it did not get me back to where i had been with 905. SamuriHL suggested an FDR, which i really didn't want to do, but after i did it, my battery life was much, much better after a couple of cycles - back to where it had been before ICS. I installed the data switch app from google play, and got into the habit of switching on wi-fi or data only when i turned on the screen, then turning it off when i was done. Smart actions can do this too, but i didn't always need data or wi-fi when i turned on the screen, so for me doing it manually was simple and easy, and it made a huge difference on battery life - from barely making it 8 hours, to going more than 24 hours, and still having 30% left on my battery. This worked for me, but do some research on what's involved with an FDR, and see if you're up to it. By the way, if you decide to do an FDR, app saver will allow you to save all your apps to your sd card and SMS backup+ will let you backup all your text messages to your google account. After the FDR you can reinstall your apps, and reload all your texts from google. Finally, look at your battery use in settings, and see if you have a particular app that seems to be consuming a lot of battery. Screen and Android OS should be the top two, then the others should be a good bit less. SamuriHL in his HoB FAQ listed a number of apps that he froze, and i found that disabling many if those apps helped me conserve battery life as well. Good luck!