SIKER&reg; Extended Battery for Irobot Roomba 500, 600, 700, 800 Series, 500 510 530 531 532 533 535 536 540 545 550 552 560 562 570 580 595 600 620 630 650 660 700 760 770 780 790 800 870 880 We don't know when or if this item will be back in stock.