With the widespread adoption of unmanned substation, the DC systems in these substations are increasingly utilizing maintenance-free lead-acid batteries. However, some operators and maintenance staff misunderstand "maintenance-free" as "no maintenance," leading to unsatisfactory actual operation of the batteries within the stations. Many substation batteries have a lifespan of 3 years or less, far from the manufacturer's designed 5-year life, effectively shortening their lifespan by 40%.
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