TECHNIQUE FOR DRIVING FAN OF BATTERY CHARGER

A battery charger in one aspect of the present disclosure includes a first attachment portion, a second attachment portion, a first converter, a second converter, a fan, a first control circuit, a second control circuit, and a signal output circuit. The first control circuit (i) controls the first converter and (ii) transmits a command to drive the fan in response to a first drive condition being fulfilled. The second control circuit (i) controls the second converter and (ii) transmits a command to drive the fan in response to a second drive condition being fulfilled. The signal output circuit outputs a drive signal in response to the first control circuit and/or the second control circuit transmitting the command(s) to drive the fan. The fan feeds a cooling air flow to the first convertor and the second converter in response to receiving the drive signal.