A mobile radiation imaging apparatus comprising: a generation unit configured to emit radiation a positioning unit configured to support the generation unit a moveable cart configured to moveably hold the positioning unit a storing unit for a radiation imaging unit that includes a radiation sensor and a first battery, the storing unit having a terminal that supplies power to the radiation imaging unit a second battery configured to connect to the terminal, the generation unit, and a cable for receiving a supply of power from an external power source and a control unit configured to control power supply from the second battery to the first battery based on a remaining amount of the first battery and a remaining amount of the second battery.
