A wheel restraint assembly pivots about a centralized axis for enabling enhanced assembly installation and removal. The connector has a surface contact portion, and the shape of the surface contact portion corresponds to the shape of terminals of the unit cell. Additionally, the system includes control circuitry coupled to the power conversion circuitry and configured to monitor charging or maintaining of the battery. The unlatching mechanism includes an unlatching actuator coupled to a latch-engaging feature, the latch-engaging feature engaging the latch of the received cassette, the unlatching actuator capable of moving the latch-engaging feature to thereby move the latch engaged therein between the engaged position and the disengaged position.