Patent ID: 6806716
Filing Date: 2004-10-19
Classification: G01R,H01M,Y02E

Abstract:
An electronic battery tester for testing a battery comprising:a source configured to apply a signal to terminals of the battery through first and second connections of a Kelvin connection to the battery; a differential amplifier having an inverting input, a non-inverting input and a difference input; a first capacitor and a first resistor configured to couple a first terminal of the battery to the inverting input of the differential amplifier and thereby form a third connection at the Kelvin connection; a second capacitor and a second resistor configured to couple a second terminal of the battery to the non-inverting input of the differential amplifier and thereby form a fourth connection of the Kelvin connection; an electrical connection between the differential output and the inverting input of the amplifier which includes a third resistor; a fourth resistor electrically connected to the non-inverting input differential; an analog to digital converter coupled to the differential output of differential amplifier; a microprocessor configured to determine a condition of the battery as a function of an output of the analog to digital converter in response to the signal applied to the battery by the source.