The higher the amperage, the more powerful the battery and the longer the backup pump will run. A 12-volt battery’s power can range from 40 to 80 amp hours or more, with 75 amp hours being the most common. Some manufacturers recommend a battery that’s marine rated, which means it will withstand moisture better than a standard 12-volt battery. The best sump pump battery backup runs on 12-volt, acid-free batteries. Since the pump sits above the water, it must be moisture-resistant but not fully waterproof like a submersible pump. The column is approximately 2 to 3 feet tall, and the pump motor sits above the floor.
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