I updated my two iPhone 7s to 10.0.2, and since then I am unable to get more than 6 hours of life out of the battery on one of them. Six hours, not six hours of usage - six hours total, wherein, I may lay the phone down for an hour and come back to the battery having drained some 11%. Both were upgraded by downloading the Firmware file, and by erasing and installing the f/w via iTunes. I tried to Reset the Phone by Erasing from within the iPhone settings, to no avail. I tried to not install ANY apps on the errant iPhone after another clean install of 10.0.2 and still the battery drain happens full speed ahoy. I've let it run down to 0% and shut itself off twice, and nothing. The phone gets HOT even on standby. I am scratching my head here. I did call Apple and they ran some remote diagnostics, but since I had just reset the iPhone they didn't have any historic battery drain stats. It is just the strangest thing because my other iPhone 7 is perfectly fine. BAD battery life, but it doesn't drain into nothingness like the errant phone. Anyone else in the same boat? Any ideas on what I might try?