A capacitor for a single-poly floating gate device is fabricated on a semiconductor substrate along with low and high voltage transistors. Received in the housing is a closing and flow restriction member which is movable by a linear drive between at least two positions. A version tracking scheme provides forward and backward compatibility between client and server software. The communication device transmits the access code to the central computer, which compares the received code with the code that the computer transmitted to the radio terminal to determine whether access should be granted. The battery management system and the first battery pack are configured such that an additional battery pack with additional battery cells connected in electrical series with respect to one another or an additional load pack with additional loads connected in electrical series with respect to one another is connectable to the battery management system. Actuation of the trigger valve releases hydraulic fluid allowing for adjustment of the control piston position.