LEAD-ACID BATTERY MONITORING DEVICE AND LEAD-ACID BATTERY MONITORING METHOD

A lead-acid battery monitoring device includes a plurality of sensor units attached to a plurality of lead-acid batteries connected in series and/or in parallel and a control unit that sequentially establishes wireless communication connection with the plurality of monitoring units . The lead -acid battery monitoring device executes a first monitoring operation in which the management unit sequentially receives monitoring data including an internal resistance and a temperature of each lead-acid battery from the plurality of monitoring units and a second monitoring operation in which the management unit sequentially receives monitoring data including the temperature of each lead-acid battery from the plurality of monitoring units .