Patent ID: 8385983

Claim:
A mobile phone apparatus comprising: a charger configured to supply power to a rechargeable battery comprising a connection portion; a main telephone device comprising: a supply power connecting device configured to switch between a first active state of supplying power from the charger to the connection portion of the rechargeable battery and a first inactive state of not supplying power from the charger to the connection portion of the rechargeable battery; a charger detection device configured to determine whether the charger supplies power; a supply setting device configured to set the supply power connecting device into the first active state when the charger detection device detects that the charger supplies power; a rechargeable battery detection device configured to detect whether the connection portion of the rechargeable battery is connected to the main telephone device; an overvoltage protection device configured to be coupled to the connection portion of the rechargeable battery and configured to switch between a second active state of supplying power output from the connection portion to a device to be protected and a second inactive state of not supplying power output from the connection portion to the device to be protected; an initialization controller configured to switch the overvoltage protection device into the second inactive state at a startup time; and a controller configured to control the overvoltage protection device to switch into the second active state when the rechargeable battery detection device detects that the rechargeable battery is connected, after the initialization controller switches the overvoltage protection device into the second inactive state.