My battery would only run the roomba for a few minutes, so I ordered another. When I installed and charged it and tried to use it, the trouble began. The seller that I bought the battery from said that the battery was not connecting and to push it in really hard. I tried that, and it worked a couple of times. I tried putting the old battery back in, and it would work a couple of times, then start the backward movement and circles. I've tried cleaning everything and blowing out the sensors with compressed air.

Vacuums - iRobot - Roomba Discovery SE Bagless Robotic Vacuum