STORAGE BATTERY UNIT

摘要

A storage battery unit (1) comprises a storage battery (2) and a monitor device (3) that receives an output from the storage battery to monitor the state of the storage battery. An activating circuit (4) includes a main switch, which, before a load being connected to the storage battery, maintains an OFF-state to interrupt the power supply from the storage battery (2) to the monitor device, and also includes a switch drive circuit that detects a drop of the terminal voltage of the storage battery occurring when a load whose value exceeds a predetermined set value is connected to the storage battery, thereby placing the main switch in an ON-state. This activating circuit (4) is disposed between the storage battery and the monitor device (3), thereby preventing the monitor device from consuming the power before the storage battery is used and further preventing the monitor device from being placed in a nonfunctioning state when the storage battery is used.