A vehicle includes a plurality of detachable battery packs that accommodate a rechargeable battery module and a battery management system in a case. In some implementations, the automatic updates can be performed based on how the mobile device is connected to a network that provides access to the application updates. The sheet pick-up roller and the sheet separation roller are partially received in the first opening and the second opening of the sheet feeding tray, respectively, so that the sheet pick-up roller and the sheet separation roller are sustained against documents on the sheet feeding tray. The capacitive trim elements are selectively enabled or disabled, thereby introducing additional delay to the delayed clock signal on the set of clock lines. The span extends in the bi-directional scanning direction, and the chord length is substantially perpendicular to the span. A closed loop link chain is wound around the effective coupling surface of the rotary members and carries a plurality of coupling elements effecting a non-slip coupling with the coupling elements of the rotary members.