I have noticed that when I charge my phone either with the USB or wall charger the battery gets hot. I am not using the phone at the time but I would like to leave it on so that I can still receive phone calls. I do have a cover on the phone but the battery did the same thing when it was off. Does anyone know why this happens?
When your device is charging, you should expect it to get warm due to the energy transfer to the battery. This is normal, as long as it is not so hot that you are unable to touch it.
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