Power banks 2026: how much capacity + can you fly with one?

A good power bank isn't just about "more capacity" — charging speed, weight and safety matter too. Here's how to pick a good-value one and fly with it legally.

How much capacity

ภาพ: Jacklee. — CC BY-SA (wikimedia)

The box figure is cell capacity — you get about 60–70% in real use.

Fast charging (as important as capacity)

• Check the wattage and standard: PD (USB-C) / QC
• For fast phone charging, look for PD 20W or higher
• For laptops you need high PD (e.g. 45–100W) and a USB-C port

Weight and ports

• More capacity = heavier — 20,000mAh can be 350–500g
• Make sure it has USB-C in/out and enough ports for your devices

Safety

Photo: Unknown — CC CC0 (rawpixel)

• Pick reputable brands with overcharge/short-circuit/thermal protection
• Avoid suspiciously cheap units with no safety information

Flying

• Carry-on only — never in checked luggage
• Under 100Wh (~27,000mAh) is generally fine; 100–160Wh needs approval

Verdict

Photo: Chenspec — CC BY-SA (wikimedia)

For most people, 10,000mAh + PD 20W or higher is the sweet spot (portable, fast). Frequent travellers charging several devices should pick 20,000mAh — and remember the carry-on rule.

Prices and models change fast — compare specs and safety standards before buying.

Sources

• Official specs from manufacturers
• Airline battery carriage rules