Lithium-ion batteries have a finite lifespan; after hundreds of charge cycles, they lose the ability to hold a charge. Try a different cable to rule out wire damage.
Why Your Phone Overheats While Charging and Dies
The Role of the Charging Port The physical connection between the cable and the phone is the charging port. Even a slight gap can cause the phone to disconnect from the power source, resulting in a net loss of battery life despite being plugged in.
Internal wires can snap, leading to an inconsistent connection that allows the phone to draw power intermittently. A failing battery can also create a scenario where it cannot accept or hold a charge, regardless of the input from the charger.
Why Your Phone Overheats While Charging and Dies
Power travels from the wall outlet, through the AC adapter, and down the USB cable into the device. You expect the battery icon to climb, yet it stubbornly refuses to cooperate or even shows a declining percentage.
More About Why does my phone die while charging
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