Electronics
Power Bank Buying Guide: Capacity, Output and Air Travel
How much capacity you really need, what output to look for, and airline limits for power banks.
· 3 min read
Key takeaways
- Real usable capacity is roughly 60–70% of the label.
- Look for USB-C PD output.
- Most airlines allow up to 100Wh in cabin luggage.
Capacity
Power bank capacity is quoted at the internal cell voltage, so you get less at the USB port. A 10,000mAh bank charges most phones about twice.
Output
USB-C PD output of 20W charges phones quickly; 65W+ can charge laptops.
Travel rules
Power banks must go in cabin luggage. Most airlines allow up to 100Wh without approval — check your airline.
Pro tip: Charge your power bank and your devices together overnight with a multi-port charger.
Frequently asked questions
Products mentioned in this article
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