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Yes, you can take a power bank on a plane, but only in your carry-on. These are the general air-safety (IATA) rules most airlines apply.
External lithium batteries are banned from checked baggage. Keep it in the cabin, in your backpack or bag, so the crew can act if anything goes wrong.
Up to 100Wh needs no approval; 100 to 160Wh needs airline approval; above 160Wh is not allowed. To calculate: mAh × 3.7 ÷ 1000. A 10000mAh power bank is about 37Wh and a 5000mAh one about 18.5Wh.
Some airlines limit the number of batteries per passenger or their use during the flight. Always check their conditions before you travel.
It depends on the airline: some allow it, others restrict it. Check their rules before boarding.
About 37Wh (10000 × 3.7 ÷ 1000), well below the 100Wh limit.