I worked for an electric utility and all of our substations had multiple cell batteries, for 4 cells to 60 cells, and we regularly replaced ONLY the bad cells. We also did monthly maintenance and voltage checks on these batteries. I would replace the single battery, with a NEW battery, and monitor the all of the batteries monthly, with a simple voltage check, and water level check.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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