Patent ID: 7850330

Claim:
A lighting device comprising: a light source; a housing generally having walls defining a cavity adapted to receive a plurality of batteries such that one or more of the plurality of batteries may serve as a power source to power the light source; and boost circuitry for boosting a voltage output, of the one or more batteries to power the light source, wherein the light source is configured to be powered by one number of batteries supplying a first voltage output and is configured to be powered by a second different number of batteries supplying a second different voltage output; wherein the housing cavity comprises a first battery compartment for receiving a first battery and a second battery compartment for receiving a second battery wherein the first battery compartment comprises a first contact that is in a contact state when the first battery is properly positioned within the first battery compartment, and wherein the second compartment comprises a second contact that is in a contact state when the second battery is properly positioned within the second battery compartment; wherein the first and second contacts of the first and second battery compartments are in a non-contact state when the corresponding first or second battery is not properly inserted in the respective first or second battery compartments; and wherein the lighting device is powered by only one battery in the first battery compartment and the second battery compartment serves as a storage compartment for the second battery as a reserve battery.