“This power bank is rated at 20,000 mAh (up to 200 W output). Could you please confirm whether it falls within your allowed lithium ion battery capacity limit for carry on (and whether it must be declared, approved, or prohibited) when flying international”
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The carry-on allowance for power banks on international flights is based on their watt-hour (Wh) rating rather than their capacity in mAh. Power banks with a capacity of 100Wh or less are allowed in airplanes as part of your carry-on luggage but cannot be placed in checked luggage. For your 20,000mAh power bank, you can calculate its watt-hour as follows: Wh = (mAh × Voltage) ÷ 1000 Most lithium-ion batteries operate at 3.7V, so: Wh = (20,000 × 3.7) ÷ 1000 = 74Wh Since this is under the 100Wh limit, your power bank is compliant with airline regulations for carry-on luggage. Ensure you check the label on the bottom of your power bank for the exact watt-hour rating. As regulations may vary by government and airline, it is advisable to confirm with the airline before your flight.
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