** New Replacement Battery for iRobot Roomba Vacuum Cleaning Robot 500 Series. ------------------------------------------------------------This UpStart Battery 2000mAh capacity battery is 100% compatible with your iRobot Roomba Vacuum Cleaning Robot. This is a quality battery that provides great performance for an excellent price.We also offer a professional class NIMH version of this battery with a capacity of 3500mAh for longer lasting extended battery life.Buy a brand you can trust. Choose UpStart Battery. Battery SpecificationsBrand: UpStart Battery Product type: Replacement Battery Battery type: NI-CD Output Volts: 14.4V Capacity: 2000mAh Color: Yellow Condition: New Warranty: One Year Warranty Part Number: -500-20This Product works in or replaces the following OEM model numbers:iRobot Roomba Original 500 Series, APS 500 Series, APS 80501. * 510 * 520 * 530 * 532 * 535 * 540 * 550 * 555 * 560 * 562 * 563 * 570 * 580 * 581 * 590 * R3