Basement Sentry Automatic Emergency Backup Sump Pump System (12V Battery Powered) Provides Additional Protection Against Basement Flooding When Power Goes Out - Amazon.com
PumpSpy 12 Volt Battery Backup Sump Pump System - Battery Backup Power Supply, High Output Emergency Battery For Sump Pump, Water Pump Backup Battery System - Automatic Emergency Battery Power Supply - Amazon.com
Wayne 12V Battery Backup Sump Pump | Solar Power & Pump Company
Blue Angel BSP25 - 12-Volt Battery Back-Up Sump System