Flying with a power bank, plainly.
Cabin bag, not hold. Here is why.
Airlines ask for power banks in cabin baggage, never in checked baggage. A battery problem is easier to handle in the cabin.
The usual limit is 100 Wh per power bank. To find watt-hours, multiply the capacity in Ah by the voltage.
Pokt Charge 10 is 10,000 mAh, rated. At 3.7 V that is about 37 Wh. Pokt Charge 5 is about half that.
Rules differ between airlines. Check yours before you fly.