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Hi, A friend of mine bought an iPhone 6 plus from apple last year. After one week using the phone it completly died. He got to apple and they said that the motherboard was fried and it would cost alot. Now one year after he gave it to me. I found that the batterry was completly dead so I bough one from ebay. The phone work for one month but battery died. What could it be ? I use an iPad to charge the phone I know it has little more power but would it kill the phone in one month ? Thanks for the help.

That may be a problem with the eBay seller’s battery, and not necessarily the phone itself. Were there any other problems with the device during that month? Overheating, charging issues, phone crashing?