Lithium Li-Ion 4400mAh Replacement Battery for iRobot Roomba 500, 600, 700, 800 Series and Scooba 450, High Capacity 4.4Ah, SUPER LONG-LIFE (800 CYCLE TIMES) by CyberTech, With Free Bonus Side Brush, 880 510 530 532 535 540 545 550 552 560 562 570 580 581