Power Bank mAh to Wh: Korea's 160Wh, Two-Unit Cabin Rule
The cabin limit for power banks is 160Wh, roughly 43,000mAh. Since 20 April 2026 it is two units per passenger, and in-flight charging is banned. Here is the mAh-to-Wh maths behind it.
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How to Choose a Power Bank: mAh, Rated Capacity, PD Output
A 20,000mAh pack won't charge your phone four times. Here is the gap between labeled and usable capacity (Wh conversion, conversion loss), PD output per device, and airline limits, worked out in numbers.