Basement Watchdog AGM Sump Pump Battery vs 12V 100AH GEL Battery Replacement for Liberty Sump Pump

Buy the Basement Watchdog battery if you own a Basement Watchdog backup sump pump system, especially a BWE, BWSP+ or Big Dog+ controller. It is a sealed 75 Ah AGM battery built for that brand's charging and alarm electronics, and owners report it lasting several years in standby service. The 100 Ah gel battery is a generic replacement aimed at Liberty and Tennant equipment; it offers more capacity but no confirmed fit with Watchdog controllers, and gel chemistry charges differently from AGM. For a Watchdog system, the matched battery is the safer pick.

• Choose the Basement Watchdog if your backup pump is a Basement Watchdog model and you want a sealed, maintenance-free battery the controller is designed to charge and monitor.
• Choose the 100 Ah gel battery if you need a larger-capacity 12 V battery for a Liberty pump or Tennant equipment and can confirm the charger is set for gel.