No, it's normal to get a little hot while charging
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About charging heat:
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The charger is equivalent to a small transformer, which converts 220V electricity into the voltage that your mobile phone can accept
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When the primary winding of the transformer is energized, the magnetic flux generated by the coil flows in the core, because the core itself is also a conductor, in the plane perpendicular to the magnetic force line will induction potential, this potential in the cross section of the core to form a closed loop and generate current, like a vortex called \"vortex\". This \"eddy current\" increases the loss of the transformer and increases the temperature rise of the transformer's core heating transformer.