Can I bring a 20000mAh power bank on a plane?

Yes — 20000mAh at 3.7V = 74Wh, which is under the 100Wh TSA/IATA limit. You can carry it on (never checked baggage). No airline restrictions on this capacity.

How many phone charges from 20000mAh?

Approximately 3-4 full charges for a modern smartphone (4000-5000mAh battery). Energy is lost in voltage conversion, so you get about 65% of rated capacity delivered to your phone.

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