The international aviation authority IATA allows power banks with a nominal capacity of up to 100 Wh (watt hours) or approx. 27000 mAh (milliampere hours). A person may take a maximum of two 100 Wh batteries in their hand luggage on the aircraft.
In most cases, the capacity is only stated in milliampere hours (mAh) on the housing of the power bank. However, the airline rules almost always state the permitted capacity in watt hours (Wh). You can use this formula to easily convert mAh to Wh to check whether your power bank is below the maximum permitted watt hours:
mAh x V ÷ 1000 = Wh
With a standard battery cell voltage of 3.7 volts (V), a power bank with 27,000 mAh would therefore have 99.9 Wh and would be allowed on the plane. Important: The capacity of the power bank in Wh or mAh + V must be indicated on the housing, the original packaging or the operating instructions, otherwise you may not be able to pass the safety check.
The ugreen homepage also states that the power bank is approved for transport in hand luggage
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