The easiest way, but the most expensive (99.-, https://mi-store.ch/produkt... ), is to buy a replacement battery because it has an extra charging station. Or call the Mi-Store in the Glattzentrum Wallisellen and ask if it is available as a spare part....
E.g. the wet vacuum cleaner can be ordered completely in individual parts, down to the smallest circuit board and cable... Or universal charger, but the battery has 25.2 volts, so it will be more expensive.

An original spare part is not necessary, as long as the connection values of the spare part fit, a universal charger can also be used for charging. You can get a suitable charger on Amazon for about 16 Swiss francs.

https://www.amazon.de/KFD-Ladege...