SIMPLE BATTERY QUALITY ASSESSMENT PROCEDURE
Keywords:
Quality assessment, survival probability, mean-to-time-failure, Failure rateAbstract
A circuit consisting of a resistor and battery was used to completely discharge an ensemble of dry cell batteries, and the number of batteries that failed in a given time were recorded (for five different brands of 1.5 V dry cell batteries, type R6 UM-3 AA
size). This data was converted into Survival Probabilities as a function of time. Using the method of least-squares linear regression, estimates of the failure rate and mean-time-to-failure of each battery brand were extracted from the survival probabilities. The results indicate that supposedly equivalent batteries (from different manufacturers) have grossly different mean-time-to-failure and thus are of different quality.
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