Buying guide
Can you bring a power bank on a plane?
Quick answer
Yes — in your carry-on only. Under FAA rules, power banks up to 100 watt-hours (about 27,000mAh at 3.7V) are allowed without approval; 100–160Wh needs airline approval; power banks are never allowed in checked bags. Some airlines add their own rules on using them in flight, so check before you fly.
Key takeaways
- Power banks go in carry-on bags, never checked luggage.
- Up to 100Wh is allowed without airline approval.
- Wh = mAh × 3.7 ÷ 1000 for typical lithium-ion power banks.
- A 10,000mAh power bank is about 37Wh — well under the limit.
How do I convert mAh to watt-hours?
Multiply the capacity in mAh by the battery voltage (usually 3.7V) and divide by 1,000. Example: 10,000mAh × 3.7V ÷ 1,000 = 37Wh. Many power banks print the Wh rating on the case.
| Capacity | Approx. Wh | Carry-on? |
|---|---|---|
| 5,000mAh | 18.5Wh | Yes |
| 10,000mAh | 37Wh | Yes |
| 20,000mAh | 74Wh | Yes |
| 26,800mAh | 99Wh | Yes |
| 40,000mAh | 148Wh | Airline approval |
Why can't power banks go in checked luggage?
Lithium-ion batteries can overheat if damaged. In the cabin, crew can respond quickly; in the cargo hold they cannot. That is why the FAA requires spare lithium batteries, including power banks, to travel in carry-on bags.
Frequently asked questions
Can I use my power bank during the flight?
It depends on the airline. Some allow use, some require the power bank to stay visible, and some prohibit charging in flight. Check your airline's current policy.
Is a 20,000mAh power bank allowed on planes?
Yes. At about 74Wh it is under the 100Wh limit and allowed in carry-on bags.