Review on Tenergy iRobot Roomba Replacement Battery 4500mAh for Roomba 500-980 Series & More by Marcus Morgan

. Battery received. Followed the setup instructions. The first launch took less than an hour! That's about 50% less than the original battery he replaced. I will remove this battery and put back the original battery to clean for at least 1 hour and 20 minutes. UPDATE: Tenergy contacted me and supports their product. A replacement battery is on the way, it will be updated again when the battery arrives. UPDATE II: Got replacement battery and again followed all instructions (can't just put battery in Roomba and go). Even less runtime than the original 1800mAh battery, but the instructions say it can take 3-5 charge cycles to reach the full capacity of the 4500mAh battery. After an initial charge (overnight), Roomba ran for 48 minutes before returning to base to charge (1 hour and 20 minutes). The second charge took 40 minutes before a charge was required (1 hour 28 minutes). The spare battery seems more like the other. The work is ongoing (1250 square feet of cleanup area), but I think you can see the pattern. To be fair, Tenergry stood by their product (hence the two stars). Unfortunately the battery just doesn't work. On paper, this battery was supposed to be about the original, which is why I took the risk and really wanted it to work. The idea of Roomba cleaning the entire required area on a single charge was what I expected from a battery, but it didn't materialize. In fact, this battery takes an extra charge to clean an area of 1250 square feet. ft. The 1800mah OEM battery works better in my case.