Hi there, I have a Samsung Galaxy s2x, and upgraded to Jellybean a few weeks back. The battery life after the upgrade was awful. Tried watching what was running (e.g. Google Now), adjusting brightness, etc, but to no avail. Koodo sent me a new battery, and it doesn't seem to be much better. In addition, when it says it is fully charged, I unplug it, and it sometimes drops down to 93 to 95% right away. Any ideas what I can do at this point? Can I undo that last upgrade?