BATTERY PACK

A battery pack according to one aspect of the present disclosure includes an attaching portion, a battery, a voltage detection circuit, a current acquisition circuit, a next current calculation circuit, a first charging stop circuit, and a second charging stop circuit. The attaching portion is electrically and mechanically connected to the battery charger. The first charging stop circuit stops charging of the battery in response to a first condition being satisfied. The second charging stop circuit stops the charging of the battery in response to a second condition different from the first condition being satisfied.