Question about Xtorm Fuel Series 5

There is also a limit of up to 100 Wh. At Swiss, you can obtain authorisation online for up to 160 Wh. But 166.50 Wh is too much.

Nein.
Dieses aber schon:
Xtorm Fuel Series (27000 mAh, 67 W, 99.90 Wh)

No, with most airlines the limit is 25000 mAh. But you can enquire in advance and obtain authorisation.