For the first several weeks my battery drain seemed fine—even better than my 6S (running on 10.0). But since I’ve been running on 10.1 and 10.1.1, I’ve gotten mediocre battery life. The 7 is supposed to run a few hours more than the 6S, but I’ve found that comparable usage gives me about the same battery life on the 7. This is a clean install, too, not from an iCloud or iTunes backup. I’ve tried resetting the network settings, I’ve turned it on and off again, I’ve disabled Location Services, I’ve turned off Background App Refresh, I’ve closed all other apps besides BMSSM, and the CPU Usage hovers right around 22%. Only when I put it in Airplane Mode does the CPU Usage drop to about 4%. Not sure what else I can try, but I do intend on bringing it in to an Apple Store if this continues over the next month.