Patent ID: 7586292

Claim:
A low voltage cutoff circuitry comprising: a) at least one primary electrochemical cell generating an electrical current powering a load; b) a first switch in a closed position between the load and the at least one primary electrochemical cell so that the primary cell powers the load; c) a sensing device that measures the at least one primary cell's voltage, transmits a close signal to the first switch in order to maintain the connection between the at least one primary cell and the load when the at least one cell's voltage is above a predetermined minimum threshold, and transmits an open signal to the first switch to disconnect the at least one primary cell from the load when the voltage is below the predetermined minimum threshold; and d) a manually operable reset switch that prevents re-connection of the at least one primary cell through the first switch to the load even if the at least one primary cell's open circuit voltage recovers to a value above the predetermined minimum threshold until the reset switch is manually reset.