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Sodium-metal halide cells have advantages other than high energy density and long cyclic life: their compact, maintenance-free design allows sodium batteries to be packaged as field-replaceable modules in a parallel system. This fundamental change from traditional data center battery architecture enables near-100% operational availability. This paper explains the advantages, requirements, and some key cautions for operating a parallel battery system. Performance data and simulated battery outage experiments from a 557 volt, parallel three-battery system will also be presented.