Posted on February 24, 2013 by CybermarketHQRP 3300mAh Green Line APS Battery for iROBOT Roomba 510 / 530 / 535 / 540 [Vacuum Cleaning Robot] Replacement plus HQRP Coaster Replacement APS Battery for iROBOT Roomba 510 / 530 / 535 / 540. Up to 2.5 hours cleaning time!