(US5757192-A)      The apparatus is able to detect a bad cell in a storage battery (12) having a number of cells. Input circuitry (54) electrically couples to first and second terminals (22,24) of the storage battery. Voltage measuring circuitry (70) coupled to the input circuitry provides a voltage output related to a voltage potential between the first and second terminals of the storage battery.    Conductance measuring circuitry (50,56,70) coupled to the input circuitry provides a conductance output related to conductance of the storage battery. Voltage and conductance comparison circuitry (56) compares the measured voltage and conductance to references and provides outputs. Output circuitry (56) provides a bad cell output based upon the results of the comparisons.    USE -   E.g. for lead-acid batteries used in automobile industry.    ADVANTAGE -   The detecting apparatus provides a quick and convenient method for detecting if a bad cell exists in a battery which does require the battery to be charged in order to make an accurate determination.    (EP990150-A1)      The apparatus is able to detect a bad cell in a storage battery (12) having a number of cells. Input circuitry (54) electrically couples to first and second terminals (22,24) of the storage battery. Voltage measuring circuitry (70) coupled to the input circuitry provides a voltage output related to a voltage potential between the first and second terminals of the storage battery.    Conductance measuring circuitry (50,56,70) coupled to the input circuitry provides a conductance output related to conductance of the storage battery. Voltage and conductance comparison circuitry (56) compares the measured voltage and conductance to references and provides outputs. Output circuitry (56) provides a bad cell output based upon the results of the comparisons.    USE -   E.g. for lead-acid batteries used in automobile industry.    ADVANTAGE -   The detecting apparatus provides a quick and convenient method for detecting if a bad cell exists in a battery which does require the battery to be charged in order to make an accurate determination.