RIDGID 1/2 HP Battery Back Up Sump Pump System RBBS - The Home Depot
Zoeller Zoeller basement sentry battery backup combo plus 1/3-HP 12-Volt Thermoplastic Battery-powered Sump Pump in the Water Pumps department at Lowes.com
Superior Pump 12-Volt Submersible Emergency Battery Backup Sump Pump System with Tethered Float Switch 92900 - The Home Depot