Just got a nice iPhone 6 from my father-in-law (thanks!), but after using it a few days I've noticed it consistently drops from 50-60%-ish power to 10%...bam, just like that! It was date-wiped before being handed over to me. Interestingly, it tends to run awhile at 10% power so almost seems like the phone isn't reading the battery life correctly. It's running 10.1.1. Anyone have this experience? Bit of a letdown...Phone wasn't used even a year and he's no super-user so this is a bit surprising. Thanks!! Note: I did check location services for apps running in the background, and basically have everything disabled..problem is still there.