I was a bit hesitant when considering buying this battery because I had read some reviews that said that once a new battery was fitted they had to go through a vacuum release process before they could be used again is working. . I haven't encountered this problem. An error code appeared on the screen of my vacuum cleaner. I removed the old batter and installed this and placed the vacuum in its docking station. When the new battery was fully charged, I pressed the "Clear" button and it worked right away. I didn't have to reset anyway.