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My charger for my s6 gets really hot after only a few minutes of charging, also it says slow charging use original charger, which is what I am doing. The phone is only 6 week's oldold.
Are you using the original USB cable as well or just the OEM charging block?
I'm using original charger and USB cable that came with phone
Is this while powered on or off during charging?
If it runs hot while charging and off, you might have a battery issue.