PWR+ 4000mAh Replacement-Battery for Irobot-Roomba 500, 600, 700, 800 Series; 880 510 530 532 535 540 545 550 552 560 562 570 580 581 582 585 595 600 620 630 650 660 700 760 770 780 790 800 870 PWR+ BATTERY: Introducing Improved Replacement for OEM Genuine Original iRobot Roomba Battery at Half the Price. This is The Real CAPACITY Battery unlike what our competition offers POWER SPECS : Battery Type: Ni-MH / Voltage: 14.4V / Capacity: 4000mAh COMPATIBILITY: iRobot Roomba 500, 600, 700, 800 Series; 500 510 530 531 532 533 535 537 540 545 550 552 560 561 562 565 570 572 580 581 582 585 587 595 600 610 Professional 611 614 620 625 620 625 Pro 627 630 645 650 651 653 654 655 660 665 700 760 770 780 790 800 805 870 880 960 R3 80501 4419696 Discovery Vacuum Cleaning Robot WARRANTY: 30 Days Refund - 12 Months Exchange. PWR+ is WA, USA based company. We are friendly Customer Support Experts