AEG AP72UB21ES - STEELSTOFZUIGER

All works fine, in the first 2 full uses, very happy with the purshase. To clean the whole place, we need to use 100% of the battery, which is just good, but with the natural deterioration of the battery, this will be insufficient soon. The station has the space for a spare battery, but I cannot find where to purschase it, which is very strange as even the charging station is expecting to have a spare to take care batter of the battery use