A battery powered device comprising a housing having a battery compartment apparatus disposed therein, with the battery compartment apparatus being configured to accept at least one battery. A work coil has a basic coil located at the innermost position, a first coil located at the intermediate position, and a second coil located at the outermost position, the latter two coils being connected in series to the basic coil. The voltage potential detection terminals of the bus bars are electrically connected to the voltage detection circuit formed on the control board through metal conductive members or lines. Any required parameter information is set in the prepared Structured Query Language statement.