A charger is provided with a housing comprising an intake port and an exhaust port. A battery interface is disposed on the housing and is configured to removably receive the battery pack. A charging circuit is disposed within the housing and is configured to supply charging power to a battery pack attached to the battery interface. A blower is provided for introducing air into the housing through the intake port and exhausting air from the housing through the exhaust port. The housing is configured to be mountable on a wall extending in a vertical direction. The exhaust port is located higher in the vertical direction than the intake port when the housing is mounted on the wall.