Patent ID: 8664912

Claim:
A system for alerting a low battery charge condition in a jump-starter, the system comprising: a first battery comprising a rechargeable lead-acid battery, a positive terminal, and a negative terminal, wherein the first battery is configured to provide a first battery voltage across the positive terminal and the negative terminal; an audible alert circuit electrically connected to the positive and negative terminals of the first battery, wherein the circuit is configured to: compare a reference voltage to the first battery voltage, and generate an audible alert when the first battery voltage is less than the reference voltage when the circuit is operative, not generate an audible alert when the circuit is inoperative, a display circuit configured to: visually indicate the first battery voltage when the display is operative, and not visually indicate the first battery voltage when the display is inoperative; a pair of connectors configured to form a corresponding pair of electrical connections between the first battery and a second battery; a first switch configured to toggle between: an ON state to maintain at least one of the pair of electrical connections between the first battery and the second battery, and an OFF state to interrupt at least one of the pair of electrical connections between the first battery and the second battery, a second switch configured to toggle between an audible alert enabled state and an audible alert disabled state through a user interaction; and wherein: when the first switch is in the ON state and the second switch is in the audible alert disabled state, the audible alert circuit is inoperative, when the first switch is in the ON state and the second switch is in the audible alert enabled state, the audible alert circuit is operative, when the first switch is in the OFF state and the second switch is in the audible alert enabled state, the audible alert circuit is operative, and when the first switch is in the OFF state and the second switch is in the audible alert disabled state, the audible alert circuit is inoperative.