1. A mobile X-ray apparatus comprising:an X-ray radiation device configured to emit X-rays;
a controller configured to control the X-ray radiation device;
a power supply configured to supply operating power to the X-ray radiation device and the controller; and
a charger configured to charge the power supply, and
wherein the power supply comprises:
a lithium ion battery including a plurality of battery cells,
at least one current sensor configured to detect current of the lithium ion battery, and
a battery management system (BMS) configured to detect an occurrence of an overcurrent in the lithium ion battery via the at least one current sensor in response to receiving an X-ray emission preparation signal, and to control on or off states of a discharge current path in which a discharge current flows from the lithium ion battery to the controller and the X-ray radiation device.