battery iphone 7

i left it on the charger last night and I wake up and it like bent and all ****ed up. I don't know what to do, I just got this thing like days ago

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...