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Reliability of standby batteries is essential in many vital applications and the systems need to be inspected and tested at regular intervals. These tests may be characterized as diagnostic, defined as collecting measurement results indicating battery problems, or actual discharge tests to measure the true battery capacity. There are several methods available for doing battery diagnostics like cell voltage monitoring or impedance/conductance/ internal resistance measurements. This presentation is not covering these methods but instead presenting a different approach for doing discharge testing using a short term capacity rating instead of the standard 8h rating.