For me iOS7 was going great, until now. My battery life is awful today, I checked the usage and usage and standby are identical... the last unique thing I did was set a reminder, but after deleting it the usage is still going up in standby. I tried toggling Reminders in all my accounts, then disabling... didn't work, now I just deleted every account and iCloud, and rebooted my phone... still doing it. This is a few day old DFU restore, restored via iCloud, then reset all settings, and it has gone to hell this easily? I just don't know what to say or do... sure the typical Macrumors fix will be "restore it", but why should I have to when it's still pretty much clean restored. iOS6 is looking tempting again... By the way, judging from my debugging it seems to have something to do with calaccessd - always restarting... can't stop it.