Battery doesn't quite fit Ecovacs Deebot 901. Battery torn off. However, I managed to unscrew the battery cover and since then the robot has been working perfectly, cleaning the entire floor with some residual charge (like when the vacuum was new). Two stars deducted as the battery doesn't quite fit the Ecovacs Deebot 901 as stated in the description and not everyone is willing to take the risk of putting it in a vacuum and may have trouble removing that battery later.