Got this roomba as a gift. Also received these lighthouses from another friend… are they compatible??? How do I get them to work? When I put batteries in lighthouse the led flashes
Cameron Sino 4000mah Battery For Irobot Roomba 614,615,640,652,665,670,671,675,677,680,681,685,690,691,695,696,801,805,850,860 - Digital Batteries - AliExpress