https://www.ifixit.com/Guide/AEG+AG901+Ergorapido+replacing+the+battery+pack/132246
AEG AG901 Ergorapido replacing the battery pack - iFixit Repair Guide
If the battery power of the vacuum cleaner decreases, you can change the battery pack. To do this, you need a soldering iron, heat-shrink tubing,...
replacing the batteryifixit repairaegergorapidopack