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Between scheduled capacity tests, we accept the proposition that a battery maintains its advertised and tested capacity. In actuality, we have little choice but to accept this premise. In some cases, but not all, we periodically check battery capacity with a complete discharge test to determine if it can deliver the power and energy required to support our critical loads. These tests are both time consuming and expensive but are considered essential to maintaining our confidence level that indeed, the batteries can deliver their rated capacity when called upon during a power outage. But then, although the system passed the last capacity test, when it is called upon during an unscheduled power outage, we are surprised (and disappointed) when the battery fails to meet backup power demands.