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Predictive Machine Learning Maintenance of VRLA Batteries based Uninterruptible Power Supply SystemsBusa, Barnabás (author)This thesis evaluates standard statistical and machine learning models for early fault detection for Valve Regulated Lead-Acid (VRLA) batteries in uninterruptible power supply (UPS) units. Unexpected battery failures in emergency support systems throughout CERN can endanger working personnel. Thus the minimization of downtime of such battery...master thesis 2021