It is an object of the invention to provide a technique to effectively prevent a power tool from being adversely affected when a battery is removed from the power tool. According to the present invention, a power tool is provided that includes a tool bit, a motor that drives the tool bit, a body that houses the motor, a battery detachably coupled to the body so as to supply driving current to operate the motor, a control device that controls the operation of the motor and a power circuit that leads the driving current from the battery to the motor. Within the power tool, the control device stops the motor prior to an interruption of the power circuit when the battery is disengaged from the body in order to prevent a large driving current from being passed through the power circuit. As a result, arc can be effectively prevented from being generated between the battery and the body of the power tool.

An electrical combination, a method and a power tool. An electrical combination may includes an electrical component including a component housing, and an electrical circuit supported by the component housing, a first terminal assembly at least electrically connectable to the electrical circuit, a second terminal assembly at least electrically connectable to the electrical circuit, a first battery including a first battery terminal assembly electrically connectable to the first terminal assembly to electrically connect the first battery to the electrical circuit such that power is transferable between the first battery and the electrical circuit, and a second battery including a second battery terminal assembly electrically connectable to the second terminal assembly to electrically connect the second battery to the electrical circuit such that power is transferable between the second battery and the electrical circuit. The second battery may be different than the first battery. At least one of the first battery terminal assembly is not electrically connectable to the second terminal assembly and the second battery terminal assembly is not electrically connectable to the first terminal assembly.

An electrical combination including a power tool manufactured by a first power tool company, the power tool including a tool housing and an electric motor supported by the tool housing and operable to drive a tool element, a battery manufactured by a second power tool company, and an adapter separate from and connectable between the battery and the tool housing to support the battery on the tool housing.

The invention provides an electrical combination including a power tool having a housing supporting a motor, which is operable to drive a tool element. The electrical combination also includes a battery and an adapter supportable on the housing of the power tool and electrically connectable to the power tool and the battery such that the adapter transfers electrical power between the battery and the motor. The adapter has a locking arrangement engageable with the battery for preventing the adapter from being removed from the power tool housing while the battery is connected to the adapter.

A power tool battery, battery charger, and a method of operating the same. The battery and the charger can be lockingly engageable with each other. The battery can be electrically coupled to a charging circuit of the charger for charging the battery. One of the battery and the charger can include a protrusion and the other of the battery and charger can include a recess for receiving the protrusion. The method can include inserting the battery into the charger along an insertion axis and charging the battery. The method can further include rotating the battery about the insertion axis to secure the battery with the charger while continuing to charge the battery.