NASTIMA Xlife 4400mAh Lithium ion Battery for iRobot Roomba 500 600 700 800 Series,1000 Times Long-Life [Premium Cells with UL&CE Approved] for Roomba 510 560 620 650 655 770 780 790 860 870 880 890 SAFE AND RELIABLE: Built-in JAPAN or KOREA Brand 18650 Li-ion cells, patented battery balancing technology, Built-in over protection circuits provide safety and reliability. ULTRA HIGH CAPACITY: 4400mAh, it provides up to 2-3 hours running time to clean your house fully in Roomba 500 600 700 800 series, please notice: this description is not available for 900 series. SUPER LONG LIFE: Lasts 5 times Longer than original 3200mAh replacement batteries / Provides more than 1000 Charge Cycles instead of original 200. COMPATIIBLE WITH: iRobot Roomba 500, 510, 530, 531, 532, 533, 535, 536, 537, 550, 551, 560, 561, 562, 563, 564, 570, 571, 577, 578, 580, 600, 610, 611, 620, 630, 640, 650, 655, 671, 675, 700, 760, 770, 780, 790, 800,805, 850, 870, 880, 890 and other 500-800 series 100% SATISFACTION: You will be 100% satisfied or we'll give you a full refund! CE, UL, RoHS, FCC MSDS, UN38.3 Certificated. 35 Days money-back guarantee and 1 year warranty.