Powerextra Ni-CD Battery 14.4V 3500mAh Replacement for Roomba 500 Series iRobot Roomba 500 510 530 532 535 536 540 550 551 562 570 572 580 590 610 760 770 780 (Electronics)
Impressive battery that perfectly hold up. It seems to me that it is more resistant than the original battery. I highly recommend!
