I bought an used iPhone 6, so no warranty here. It's been working fine for a week but now a weird thing happened. I had my battery at zero and I borrowed my friends charger to charge it. I charged it a bit but it unfortunately fell on the ground during that. It was in a case and it has a protective glass on it so nothing seemed to had happened and it was working fine. Before I got home, the battery went back to zero so I put it my MacBook's usb port and it surprisingly managed to get charged to 12% really fast but then it stopped and it does not want to charge any more, I dont have any other cable but i tried to plug it into a socket with two different adapters with no success. Also note that the weather is really coled now in my place. And after it stopped chargind I tried to plug it in again after a few tries and my MacBook suddenly turned off. Also I updated the iPhone to the newst ios this morning. Now the phone turned off because the battery got out of energy. I tried to turn it on, most times it showed the usual red battery and a cable picture, but twice it showed the apple logo, then the black screen and then it turned off. Can you help me with that, I will try another cable in the morning but what if it will not help?