Abstract: An implementation of a battery cradle includes a tray, a first side frame attached to a first side of the tray, and a second side frame attached to a second side of the frame. The first side frame and the second side frame face each other and are substantially parallel to one another. Both the first side frame and the second side frame include a plurality of generally circular recesses, in which each recess on the first side frame is opposite to and aligned with a recess on the second side frame. Each pair of aligned recesses accommodates a generally cylindrical battery. According to various implementations, the tray includes (i) a plurality of depressions, each of which is aligned with a pair of aligned recesses and (ii) a plurality of slats configured to accommodate a prism-shaped battery pack.

Abstract: An adjustable idler gear assembly comprises an idler gear that meshes with a mating gear and is driven to rotate by a pinion directly or indirectly via at least one intermediate gear, and an idler positioning body having an idler gear shaft with which the idler gear is rotationally coupled. The idler positioning body is configured to change a position of the idler gear shaft along a circular path at a range of distances from an axis of rotation of the pinion to selectively engage and disengage from being driven by the pinion while maintaining a consistent mesh with the mating gear.