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Abstract

A method of detecting battery capacity in a zinc-air battery. The method includes the steps of removing all non-essential loads from the battery for a first period of time, thereafter and for a second period of time, applying a constant load to the battery, periodically sampling the voltage of the battery, and, as a function thereof, determining whether a condition is satisfied during the second period of time, the satisfying of the condition indicating low battery capacity. The method of detecting battery capacity can also determine battery usage on a real-time basis in which an accumulator is loaded with a value representing an expected zinc-air battery capacity, loads on the battery are detected, and the accumulator is decremented based on the detected actual usage. The accumulator reaching a minimum value indicates that the battery capacity is low.

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