4500mAh Ni-MH Battery for APS iRobot Roomba R3 500 510 520 530 531 532 535 540 550 555 560 562 563 564 570 580 581 770 780 fits 80501 Discovery series robot vacuum cleaner (Misc.)
So far, everything was great! Battery fits perfectly (in the Roomba 780, since he is namely now) and draws a multiple of time compared to the old, broken battery has still managed a maximum half an hour. Let's hope it stays that way. I am very please