Abstract: An electronic equipment includes a main body, a mounting portion that is provided in the main body and on which an accessory can be mounted, a battery that is stored in the main body, a battery voltage detection portion that detects an output voltage of the battery, an external power source supply portion which supplies the electric power from the battery to the accessory mounted on the mounting portion, and a control portion which determines the remaining capacity of the battery on the basis of the threshold value to be set based on accessory information on the accessory and a detection result of the battery voltage detection portion.

Abstract: A camera system having a camera body which is attachable to an accessory, such that the camera body includes a detection unit to detect that the accessory is in the process of being installed on the camera body, the detection unit having a detachment pin which sets a detachment switch ON or OFF. When the detection units detects that the accessory is in the course of installation, a semiconductor switching element (a MOSFET) is set OFF, and the provision of a power supply from a battery to a contact point of a electrical contact point unit of the camera body is stopped. As a result, the power supply is not provided to the accessory and various disadvantages are avoided when the accessory is in the course of installation. In addition, the power supply can be safely provided to the accessory regardless of any communication.