RAVPower RP-PB043
20100 mAh, 100 Wh
RAVPower RP-PB043
20100 mAh, 100 Wh
Theoretically yes, but certainly only in hand luggage. Ultimately, however, it is the airline that decides.
Maybe the Pi is drawing more current than you are charging into the Powerbank.
RAVPower is too weak to charge the battery of a Surface Book 2. The output is 9~12 V 1.5 A max. The power supply of the Surface Book 2 has an output of 15V 6A. That is much more. A suitable cable might exist (google for "surface book to usb charge"). In principle, you could charge the Surface Book via the USB-C port. Microsoft warns against this, though:
Yes, you can normally charge your Surface
I had exactly the same problem. After 20 hours of continuous charging, there was still no more juice. In the meantime, I bought a powerbank of another brand, which has rarely been used for 3 years but runs perfectly.