Mighty Max Battery 14.4v 2000MAH Battery for iRobot 4000 Discovery - 2 Pack Brand Product INCLUDES 2 - 14.4V 2.0AH NICD BATTERY THIS BATTERY IS FULLY COMPATIBLE WITH ALL ROOMBA FLOORVAC MODELS COMPATIBLE WITH IROBOT MODELS: IROBOT DISCOVERY SERIES, IROBOT DIRT DOG MODELS MIGHTY MAX BATTERIES ARE MADE WITH THE HIGHEST QUALITY MATERIALS 1 YEAR WARRANTY