2 Packs CREJOY&trade; 3500mAh Battery for Irobot Roomba 500 510 530 531 532 533 535 536 540 545 550 552 560 562 570 580 581 585 595 600 620 630 650 660 700 760 770 780 790 800 870 880 R3 80501 4419696 Fully charge before use (at least 12 hours).Higher Capacity 3500mAh,it runs for well 1.5 to 3 hours with no problems after fully charge. Make sure to run this battery fully down a couple of times to properly condition it. Best to unplug the docking station and push the docking button in insure complete depletion. Easy install and it fits perfectly.Keep your Roomba cleaning up all the cat hair, cat litter and whatever else was on the floor Brand New Replacement Product, Works as Genuine Parts.Easy to charge and connect APS battery compatible with all Roomba 500&700&800 series. Safeguard features against incorrect voltage, short circuit, internal overheating.