Abstract: An asymmetric battery testing apparatus tests a battery unit. The battery testing apparatus includes a first wire, a second wire, a third wire, and a testing circuit. The testing circuit includes a test-enabling unit and a control unit. Each wire has a resistance. The test-enabling unit includes a resistor to obtain a first resistor voltage value and a second resistor voltage value. The control unit obtains a battery internal resistance or a battery internal conductance which is a reciprocal of the battery internal resistance of the battery unit according to a battery internal voltage value, a wire voltage value, a first testing voltage value, a second testing voltage value, a testing resistance, the first resistor voltage value, the second resistor voltage value, and the resistances. Accordingly, shorter test time, lower contact failure, higher accuracy, lower power consumption, lower costs, and smaller size are implemented.

Abstract: An asymmetric battery testing apparatus tests a battery unit. The battery testing apparatus includes a first wire, a second wire, a third wire, and a testing circuit. The testing circuit includes a test-enabling unit and a control unit. Each wire has a resistance. The test-enabling unit includes a resistor to obtain a first resistor voltage value and a second resistor voltage value. The control unit obtains a battery internal resistance or a battery internal conductance which is a reciprocal of the battery internal resistance of the battery unit according to a battery internal voltage value, a wire voltage value, a first testing voltage value, a second testing voltage value, a testing resistance, the first resistor voltage value, the second resistor voltage value, and the resistances. Accordingly, shorter test time, lower contact failure, higher accuracy, lower power consumption, lower costs, and smaller size are implemented.

Abstract: The battery tester has a casing having an input device and two detecting wires, a microprocessor, a loading unit and a battery power status detector. The microprocessor builds a strategic decision process therein to determine a discharge time of a battery according to an output current, a preset load having 1/N CCA (Cold Cranking Amps) and a preset loading time inputted from the input device. Therefore, the battery tester can detect the health of batteries with different capacities and provides accurate detecting results.

Abstract: The present invention discloses a battery tester having high precision, which has a casing having an input device and two detecting wires, a microprocessor, a variable loading unit and a battery power status detecting unit. The microprocessor builds a strategic decision process therein to determine a proper resistance of a load for a battery according to the battery capacity, initial voltage and detection requirements having 1/N CCA and loading time. When the resistance of the load is determined, the microprocessor adjusts a resistance of the variable loading unit equal to the resistance of the load for the battery. Therefore, the battery tester does not use the load with the fixed resistance to detect batteries with different capacities and has accurate detecting results.

Abstract: The battery tester has a casing having an input device and two detecting wires, a microprocessor, a loading unit and a battery power status detecting unit. The microprocessor builds a strategic decision process therein to determine a loading time for a battery according to the battery capacity, battery voltage and detection requirements having 1/N CCA and a loading time input from the input device. Therefore, the battery tester detects batteries with different capacities and has accurate detecting results.

Abstract: The present invention discloses a battery tester having high precision, which has a casing having an input device and two detecting wires, a microprocessor, a variable loading unit and a battery power status detecting unit. The microprocessor builds a strategic decision process therein to determine a proper resistance of a load for a battery according to the battery capacity, initial voltage and detection requirements having 1/N CCA and loading time. When the resistance of the load is determined, the microprocessor adjusts a resistance of the variable loading unit equal to the resistance of the load for the battery. Therefore, the battery tester does not use the load with the fixed resistance to detect batteries with different capacities and has accurate detecting results.

Abstract: A detachable battery status alarm has an alarm device and at least one battery detector. The battery detector is directly mounted on the battery and electronically connected to the battery. The alarm device links to the battery detector to obtain the battery status in a physical connection or a wireless connection. Therefore, the alarm device does not physically connect to the battery or batteries to test the battery or batteries.

Abstract: A detachable battery status alarm has an alarm device and at least one battery detector. The battery detector is directly mounted on the battery and electronically connected to the battery. The alarm device links to the battery detector to obtain the battery status in a physical connection or a wireless connection. Therefore, the alarm device does not physically connect to the battery or batteries to test the battery or batteries.

Abstract: A car battery jumper cable apparatus for examining whether polarity of a supplementary battery and an exhausted car battery is correctly connected. The jumper cable apparatus includes a relay, a relay driving circuit, a battery polarity recognition circuit, a signal oscillator, an alarm circuit of reverse battery polarity, an indicator light for discharged battery connection, and an indicator light for recharged battery connection. In addition, the signal oscillator will control a battery recharge procedure according to immediate recharged current status, so as to provide secure protection for recharge.