Rechargeable battery for all iRobo Roomba 400 Replacement Specifications Rechargeable battery for Replacement iRobot Roomba 400 Series Vacuum Cleaning robot Battery description: Model: Roomba-400 Cell Type: Ni-MH Voltage: 14.4V Capacity: 3A-3.3A-3.5A-4A-4.5AReplacement rechargeable battery for iRobot Roomba 400 Series, Discovery Series and Original models. Compatible with iRobot Roomba 400 Series, Discovery Series and Original models. Powers Roomba for up to 120 minutes of continuous clean up. Note: Not compatible with Roomba 500 Series robots. Reminder: Keep a second battery on hand to double Roomba's cleaning time