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Sodium Metal Chloride (SMC) batteries have now been commercially deployed and successfully operating in stationary backup applications for greater than five years. This paper will discuss the results of the testing of the quarter service life (5 years) capacity of field installed sodium metal chloride batteries in a standby application (MTSO). The FZSoNick 48TL200 Telecom series batteries will be the subject used in this document. The tests were conducted by the end user’s agent and data was collected by both a third-party service vendor and the manufacturer.