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There's a reason you see a lot of 26,800mAh power banks for sale--because that's the largest size you can carry on without getting special permission. Note that the power bank industry is a bit deceptive--the number is the capacity of the cells, not the power it will actually deliver to whatever ports it has. The voltage is being stepped up from the cell ...


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The IATA passenger guidelines for lithium batteries for passengers are here. Your powerbank has a capacity of 30000 mAh, which probably means 111000 mWh (based on the 3.7V nominal voltage of lithium batteries), or 111 Wh. Note if they don’t display their capacity in Wh (or mWh), most people would use the 5V output and count 150 Wh. This means they exceed the ...


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