VRLA has been widely used in power system for its characteristics of pollution-free sealing, maintenance-free and low self-discharge, and is often called “maintenance-free battery”. Because in the actual maintenance work, it is often mistaken for a battery that does not need maintenance, but “maintenance-free” is not no maintenance, it is relative to

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the maintenance of the original open liquid-rich lead-acid battery. VRLA for power systems generally has a large capacity, and is mostly used as a backup for DC power supplies, which are put into use in power outages and accidents. In the event of a power outage, many important equipment must rely on batteries to maintain operation. Therefore, it is necessary to pay attention to the maintenance method of lead-acid batteries in daily work, from the environmental temperature, discharge current, discharge time, uniform charging and floating charging voltage and other comprehensive maintenance, in order to ensure the battery capacity and service life, to avoid heavy economic losses in power accidents. ?