A battery compartment for a device has a single cavity that is segmented into discrete slots, each slot associated with projections that secure and immobilize any batteries inserted into the compartment. Each slot is sized to receive a different size of battery, and the slots are positioned relative to one another to prevent batteries of different sizes from being inserted into the compartment. Ashelf may be integrated within the slot(s), and the shelf may include a channel or a multi-planar yet unitary contact member to establish a single point of electrical connection between the battery compartment and the device.