It's no problem in hand luggage.

Exactly in hand luggage

Yes (hand luggage!)

If you put the Anker 737 in your normal suitcase, it will be taken away from you. You have to put it in your hand luggage. Zurich Airport informed me. When I arrived in rice country in the summer of 2023, there was only one letter from Zurich Airport enclosed. Large powerbanks are removed for security reasons, you can pick up the powerbank for 30 days in Zurich.

The international aviation authority IATA allows powerbanks up to 100 Wh (watt hours) nominal power or approx. 27000 mAh (milliampere hours). A person is allowed to take a maximum of two 100 Wh batteries on the plane in their hand luggage. Otherwise I would ask the airline