Expandable battery compartment

In a battery-powered electrical device, an expandable battery compartment for accommodating batteries of varying size, said battery compartment comprising:

• a battery casing defining a substantially cylindrical recess for at least partially encapsulating a battery, said recess having an open end for receiving a battery and a closed end;
• a first electrical contact element positioned on or adjacent the closed end of the recess for contacting a terminal of a battery, said first electrical contact being electrically coupled to circuitry of the electrical device;
• a cover configured to be releasably mounted to the open end of the recess for selectively concealing the open end and defining the battery compartment;
• a second electrical contact element for contacting an opposing terminal of the battery;
• and
• a plurality of means positioned on the cover for receiving the second electrical contact element, wherein each means for receiving is positioned at a discrete location on the cover and configured to independently receive the second electrical contact element to accommodate batteries of varying size within the battery compartment.