• Battery type: Ni-MH, Voltage: 14.4 V, Capacity: 4800 mAh, high capacity for your Roomba. • Compatible with all Roomba 500, 600, 700, 800, and 900 series robot vacuums, including Roomba 500, 501, 510, 520, 521, 525, 530, 531, 532, 533, 535, 536, 540, 545, 550, 551, 552, 555, 560, 562, 563, 570, 580, 581, 585, 590, 595, 600, 610, 611, 614, 618, 620, 625, 627, 630, 650, 653, 654, 654, 655. 5, 660, 670, 700, 760, 761, 770, 780, 790, 800, 860, 870, 871, 880 and many others. • Overcharge, deep discharge, and overload protection functions provide protection against short circuits and constant voltage circuits, all of which extend the battery's lifespan. • Ni-MH batteries reach their maximum performance after 3 to 5 full charge cycles. • The package includes one battery and 2 side brushes.