Abstract: An intelligent car battery-charging cable device adapted to provide electrical connections between a first battery and a second battery. The device includes a power controller that regulates power through the device, power cables that connect the power controller to the terminals of the batteries. A triggering device detects proper connection between the power cables and the terminals of the first and second batteries, upon which the triggering device generates a triggering current to activate the relay closing device to close the normally open switch of the relay closing device to close the circuits between the terminals of the first and second batteries. The triggering device is unable to activate the relay closing device and the circuits between the terminals of the first and second batteries, unless the two circuits connected to each of the power cables are both connected to the terminals of the first and second batteries.

Abstract: A battery jumper cable with a polarity indicator is disclosed which includes a positive power and negative power connecting wire, the two ends of which are respectively disposed between donor battery end clips and depleted battery end clips for clipping the terminals of the donor and depleted batteries; and a polarity indicator including a donor battery indicating means, a depleted battery indicating means, and an override protective means. The override protective means is disposed between the clips of the positive and negative battery connecting wires. The donor and depleted battery end indicating means includes light emitting diodes positively connected between the positive and negative battery connecting wires, respectively, near the donor and depleted battery ends. When the connections to the donor and depleted battery ends are correct, the light emitting diodes are energized to emit light to indicate the correct connection.