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Assessing the Remaining Life of Liquid Reserve Batteries

The test focused on determining the probability of failure of the battery under various stress temperatures. Prior knowledge of the battery temperature thresholds was used to set the initial chamber temperature. Testing at temperatures any higher than the threshold would have overstressed the battery and caused undesirable failure mechanisms. Adaptive highly accelerated life testing (HALT) and parametric survival analysis were used to identify input conditions for an accelerated life test (ALT). Results of the ALT analysis provided insight into the expected remaining lifetimes of the batteries.