Patent ID: 8301207

Claim:
A separable mobile terminal device comprising: a main module to execute main functions in order to drive the mobile terminal; and a user module to receive and transmit at least one of visual and aural signals, wherein at least one of the main module and the user module has a control unit to determine whether to execute the interworking between the main module and the user module depending on whether the main module and the user module are connected, and whether the interworking between the main module and the user module is required, wherein each of the main module and the user module has an interface unit to enable data transmission/reception, and a battery to supply driving power, wherein each of the main module and the user module has a connection means, so that the main module and the user module can be connected with or separated from each other through the connection means, and wherein when connected, the control unit limits charging of each battery of the main module and the user module based on at least one predetermined condition, to reduce heat in the mobile terminal device.