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This paper will show specific data observed on Valve Regulated Lead Acid (VRLA) battery installations in typical telecom locations. This will be primarily a summary of the information obtained through extensive field observations in multiple climate, cabinet design and operating conditions. These data observations and other published data suggest that capacity loss in VRLA batteries can occur at random intervals, which make scheduling maintenance difficult. This is an obvious source of concern if you don't know which sites may need maintenance and when to schedule it.