An apparatus for protecting a mobile communication terminal having a built-in battery from an electric charging and method thereof are disclosed, by which the mobile communication terminal is protected against a problem generated from using a false battery. The present invention includes a power unit, an electric charging control unit controlling an electric charging of the power unit, a control unit deciding whether the built-in battery is a correct battery by recognizing a serial number of the built-in battery, the control unit outputting a control signal for controlling the electric charging of the power unit, and a switching circuit switching a supply of an electric charging power applied to the battery according to the control signal of the control unit.