Two weeks ago I flashed 'Stock JellyBean 4.1.2 V7 ULTRALIGHT' from DevSwift1 on my girlfriend's Xperia U. The phone was finally running smoothly. However the battery drain is bugging her. Her phone is draining a lot of battery during the day while she is not using her phone a lot, her battery can't even hold out for a day.
Is there anyone else with the same problem? What could be the cause of this problem? How should I fix this?
Thanks in advance