This is just factually wrong, the issue is not the battery, the issue is power delivery which in turn causes premature battery failure. In a UPS environment (which this is) the phone always pulls power from the battery itself and is never pulls power from an unfiltered source (ie direct current from the outlet). What is going on is some kind of general protection fault, originally caused by the phone pulling too much power from too few cells. If left unchecked that would lead to a thermal runaway, overheating the battery, swelling it and causing a fire. This is exactly what happened with the Note 7 and some iPhone 8s. Again, emphasis: **TOO MUCH CURRENT FROM TOO FEW CELLS**