The battery worked well, but not for long. Now he sits on the base and shows the color green. But when you start using it, it says "Please charge the Roomba". Arrived at the base, it flashes amber quickly. After many hours, it will be permanently green. And the cycle begins again. If I had acted quickly I could have returned it in the return window. But I was hoping that it would recharge and work. I about it on May 21st.