Amazon.com: NASTIMA 14.8V 5000mAh Lithium ion Replacement Battery Compatible with iRobot Roomba 960/895/890/860/695/680/690/675/640/614, Replace The Original 1800mAh Lithium ion Battery : Home & Kitchen
iRobot Roomba 521 Battery
Batteria compatibile per iRobot Roomba 500, 510, 520, 521, 530, 531, 532, 535, 540, 550, 555, 560, 562, 570, 580, 610 Professional : Amazon.it: Casa e cucina
iRobot Roomba 521 Battery
Melasta 14.8V 4.4Ah/ 5.2Ah Li Ion Batteria per iRobot Roomba Serie 500 600 700 800 550 560 595 650 655 770 780 790 870 880 866|Batterie di ricambio| - AliExpress