The operational lifespan of a specialized backup sump pump battery typically ranges between 3 to 5 years, depending heavily on battery chemistry, ambient basement temperatures, and how frequently the backup system is called into service. Standard lead-acid wet-cell batteries require periodic water level checks and degrade faster, whereas sealed AGM (Absorbent Glass Mat) batteries generally offer better longevity and zero maintenance. Verification: Check your battery installation date label and test its voltage output annually using a digital multimeter.
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