A battery-operated lighting device for use with any one of several rechargeable
battery packs, each battery pack having a pair of terminals and a different operating
voltage. The lighting device includes a casing having first and second parts, a
lighting unit including a light bulb located at the first casing part, and a battery
chamber at the second casing part for receiving at least part of and locating the
battery packs. The light bulb has an operating voltage. A pair of electrical contacts
is located in the chamber for making electrical connection with respective terminals
of a battery pack located by the chamber. The casing houses an electronic voltage
regulating circuit that has an input and an output in electrical connection with
the contacts and the light bulb, respectively. The circuit regulates the voltage
of the battery pack to substantially the operating voltage of the light bulb for
operating the light bulb.
