I'm having major battery issues. First, it drains significantly faster than it used to. I have tried dimming the screen to 20%, and turning off location, bluetooth, syncing, and wifi. This has helped but not returned my phone to its normal battery life. Also, having to do the above things just to have my phone work all day is fairly extreme.
I can not for the life of me figure out why they would take the auto screen brightness option out of this phone. There is an app for older xperia phones that lets you turn it off, it doesn't work on our ion. I've tried a few other screen control apps but none could turn off the auto brightness. It wouldn't bother me so much, except the transition is so jumpy in certain lighting situations.