When your regular sump pump fails, whether because of malfunction, or overuse during those rainy months, you need a backup ready to protect your basement. Many battery operated kits include a 12 volt pump and battery casing. Check the capacity recommendations on the manufacturer’s form. Then, mount the battery sump pump next to the main pump, and position the float switch at the manufacturer’s recommended height using brackets that are included in the kit. Next, turn of the power, and attach the battery sump pump discharge pipe to the main pump, mounting the battery casing around two to three feet above the pit area. Make sure to attach the cable connections to the battery casing according the included instructions. Mount the battery charger as far from battery casing as possible. Install the battery in the casing, attach the pump, then float switch and finally battery charger. Once the connections are complete, plug it into an approved outlet, turn the power on and test the pump.