Chosen Solution
I recently upgraded my phone and left my old iPhone 6 in a draw. It was working perfectly fine before so I guess has just completely discharged its battery over the last couple of weeks. I’ve just tried to charge it and it won’t. I’ve tested several chargers and cables, checked the charging port for debris, and everything is fine. It just wont charge. Any thoughts or ideas as to how I can get this device to charge again. Thanks.
If batteries drop below a certain amount of voltage then they won’t charge. You could try charging it for a few hours, as this sometimes gets it back up. Or you could try replacing the battery. If you have used cheap cables on it, then you will have more than likely damaged the tristar chip/U2 IC, and it would need replacing by someone who can microsolder. :-)