I've been suffering from moderate battery drain since upgrading to iOS 7. I've tried all the tricks on the forum with no real success. What I have noticed though is that my drain is not consistent. When I'm at home or out in areas with good signal my drain isn't bad. At work, where the signal is bad, the drain is massive, even without me using the phone. Now I know poor signal = more battery use. But it seems as though this is amplified multiple times compared to iOS 6. Could this be the way iOS 7 handles poor signal?