Zoeller 585-0005 Aquanot II Battery Backup Pedestal Sump Pump System with Electronic Charger Extra protection when your primary pump fails for any reason No interruption in pump performance because of power outage or failure of primary pump One of the most reliable and well-established battery backup systems in use today Pump has heavy-duty, 12 V motor and positive contact float switch Equipped with automatic electronic 28 amp charger