![Amazon.com: melasta 6400mAh Lithium Battery Replacement Compatible with iRobot Roomba 675 655 650 860 870 880 890 660 677 770 780 535 551 585 595 & 500 600 700 800 Series : Home & Kitchen Amazon.com: melasta 6400mAh Lithium Battery Replacement Compatible with iRobot Roomba 675 655 650 860 870 880 890 660 677 770 780 535 551 585 595 & 500 600 700 800 Series : Home & Kitchen](https://m.media-amazon.com/images/I/51hnhBgn0ML.jpg)
Amazon.com: melasta 6400mAh Lithium Battery Replacement Compatible with iRobot Roomba 675 655 650 860 870 880 890 660 677 770 780 535 551 585 595 & 500 600 700 800 Series : Home & Kitchen
![Got a free robot vacuum and the 10 cell Ni-MH battery is dead. I'd like to rebuild it as a 3S Li-Ion or Li-Po, but the weird shape of the battery is Got a free robot vacuum and the 10 cell Ni-MH battery is dead. I'd like to rebuild it as a 3S Li-Ion or Li-Po, but the weird shape of the battery is](https://preview.redd.it/141makew2rf71.jpg?width=640&crop=smart&auto=webp&s=7797be71113d79db90c3e57d768ae4c9acb5db80)
Got a free robot vacuum and the 10 cell Ni-MH battery is dead. I'd like to rebuild it as a 3S Li-Ion or Li-Po, but the weird shape of the battery is
![Amazon.com: melasta 6400mAh Lithium Battery Replacement Compatible with iRobot Roomba 675 655 650 860 870 880 890 660 677 770 780 535 551 585 595 & 500 600 700 800 Series : Home & Kitchen Amazon.com: melasta 6400mAh Lithium Battery Replacement Compatible with iRobot Roomba 675 655 650 860 870 880 890 660 677 770 780 535 551 585 595 & 500 600 700 800 Series : Home & Kitchen](https://m.media-amazon.com/images/I/718qmvetPiL._AC_UF894,1000_QL80_.jpg)