AMG Battery Standby Sump Pump Battery 12V 81.5 AH by Basement Watchdog - Sump Pump Batteries

Maintenance free - no need to add battery fluid or distilled water;Runs sump pump intermittently for days;Compatible with BWE, DFK961, Basement Watchdog special, BWSP+, BWD12-120C+ and BW4000;Up to 80-hour protection (based on a 10% duty cycle) on the BWE and DFK961;Not compatible with older versions of BWSP, BWD12-120C or BW4000 systems.