However, they are specialty batteries and often cost much more than the Wet Cell plus, they may require a special charger.īackup sump pumps often are sold as complete units and contain most of the necessary parts, including a charger. These are important considerations because the battery will be located in the basement, which often has higher humidity than outside air. The Gel Cell and AGM are preferred for backup sump pumps because the plates do not sulfate easily, the terminals don’t corrode and the chance of a hydrogen gas explosion occurring is small. Some versions of the lead-acid battery that you may find in stores are the Wet Cell, Gel Cell and Absorbed Glass Mat (AGM). However, for backup sump pumps, this type is not as preferable as a deep-cycle battery. The AH rating usually is printed on the top of the battery.Ĭombination 12-volt lead-acid batteries have a CCA and an AH rating. For example, if a battery has a rating of 80 AH, it would provide 4 amps an hour (80/20) for 20 hours. The standard AH rating indicates the number of amps provided in excess of 20 hours. This type of battery is rated in ampere-hours (AH). This is not the type of battery to use with a backup sump pump except in an emergency.Ī deep-cycle lead-acid battery (sometimes called a marine battery) is recommended for backup sump pumps. The number of CCAs often is printed on top of the battery case. The output and capacity of these batteries are rated in cold cranking amps (CCA). These batteries are designed to provide a large amount of current for a short period of time. Most people are familiar with the standard lead-acid vehicle battery used in a car. Two types of lead acid batteries are available.
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