A method and apparatus for diagnosing the status of a battery having high and low voltage plateau states corresponding to its state of charge in which the battery open circuit voltage is measured (S106) to determine its voltage state and its internal resistance also is measured (S114). A battery having a low voltage state (S116) is tested to determine if its internal resistance is greater than a predetermined maximum resistance (S118) and if it does the battery is considered as possibly having a low electrolyte level, and if it does not the battery is su...
[ We claim:] [1.]1. A method for diagnosing a battery having high and low open circuit voltage states corresponding to state of charge conditions of the battery, comprising:measuring the internal resistance (IR) of the battery;measuring the battery open circuit voltage (OCV);comparing the battery's measured internal resistance to a predetermined maximum internal resistance (IR.sub.MAX) for the battery; andsubjecting a battery having an internal resistance less than said predetermined maximum internal resistance to a type of state of charge (SOC) test dep...
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