The present invention provides a bicycle comprising a pivot interface between a battery and a frame. The pivot interface includes a pivot mount defining a recess on one of the frame and the battery, and an eccentric boss on the other of the frame and the battery. The boss has a first boss width that is insertable into the recess when the battery is in a first position, and the boss further has a second boss width larger than the first boss width and creating an interference fit with the recess when the battery is in a second position. At least one of the pivot mount and the boss is resilient in order to accommodate the interference fit. Preferably, the pivot mount is on the frame and the boss is on the battery, and also the pivot mount preferably comprises a resilient material.