I would have to rephrase the comment a bit. "It seemed as if the battery capacity was at 10%". The motor ran slower and slower until it finally switched off. The cell type used in the product is 0815, you can get these cells everywhere in the specialised market, changing them was not a challenge. Nevertheless, the runtime did not change in the slightest. This means that the battery in the device was probably still in top condition. The runtime must have been artificially limited. Now, thanks to Electrolux's greed for profit, "environmentally harmful" (manufacturing) lithium batteries and copper have ended up in the electrical waste and that makes me angry. I never got an answer to my emails to Electrolux!

How could one find out?