BATTERY MANAGEMENT SYSTEM

A battery management system includes monitoring devices arranged in a housing that houses batteries and a control device. The monitoring device includes (i) a monitoring IC capable of acquiring battery information and (ii) a wireless IC. At a start-up time of the plurality of monitoring devices, each of the wireless ICs performs an advertising operation in a cyclic advertising event for establishing a connection of wireless communication between the plurality of monitoring devices and the control device, and the control device performs a scan operation. The wireless IC of each of the two or more monitoring devices has, respectively, an event management unit that manages a generation cycle of the adverting event, for performing the advertising operation at respectively different timings.