5000mAh Power Bank on a Plane? Wh & Airline Rules
Page updated · Sources and review method
At 3.7 V, 5,000 mAh is 18.5 Wh. That is within the common 100 Wh threshold, but airline and route conditions still apply.
The voltage matters.
These examples assume a 3.7 V nominal battery. Read your actual label: the same mAh at a different voltage gives a different Wh. USB charging output is not the nominal battery voltage.
This guide covers capacity, not certification, recalls or the condition of your particular product.
Power bank flight checker
Within the general 100 Wh capacity threshold. Select your airline to check its specific restrictions.
Does a pocket-sized battery count as a power bank?
Yes. A small battery pack used to charge another device is still a power bank, including a magnetic or wireless pack. At 5,000 mAh and 3.7 V, its calculated energy is 18.5 Wh. Its small physical size does not make it an installed phone battery or exempt it from a carry-on requirement.
Can I bring several small banks instead of a large one?
Quantity is counted in devices. Two 5,000 mAh packs do not become one 10,000 mAh pack for an airline’s allowance. Our listed Southwest and Emirates policies allow one power bank per passenger, so two small packs can exceed the limit even though their combined energy is low.
Which number should I check on a wireless pack?
Look for the battery’s Wh rating and nominal voltage, not the wireless charging output in watts. At 3.85 V, 5,000 mAh calculates to 19.25 Wh. Both examples are below 100 Wh, but a missing label, recall or route certification requirement can still prevent acceptance.
Last checked 2026-11-04
How that capacity compares by airline
Capacity guidance at 3.7 V. Open an airline’s page for quantity and onboard restrictions.
| Airline | Capacity result | Quantity |
|---|---|---|
| American Airlines | Carry-on only | 2 |
| United Airlines | Confirm with the airline | Confirm |
| Delta Air Lines | Carry-on only | 2 |
| Southwest Airlines | Carry-on only | 1 |
| Emirates | Carry-on only | 1 |
| Qatar Airways | Carry-on only | 2 |
| British Airways | Carry-on only | 2 |
| Lufthansa | Carry-on only | 2 |
| Korean Air | Carry-on only | 2 |
| Singapore Airlines | Carry-on only | 2 |
| Cathay Pacific | Confirm with the airline | 2 |
| ANA | Carry-on only | 2 |
| Japan Airlines | Carry-on only | 2 |
| AirAsia | Confirm with the airline | Confirm |
| Etihad Airways | Carry-on only | 1 |
Power bank flight FAQs
Quick answers before you pack.
Does a pocket-sized battery count as a power bank?
Yes. A small battery pack used to charge another device is still a power bank, including a magnetic or wireless pack. At 5,000 mAh and 3.7 V, its calculated energy is 18.5 Wh. Its small physical size does not make it an installed phone battery or exempt it from a carry-on requirement.
Can I bring several small banks instead of a large one?
Quantity is counted in devices. Two 5,000 mAh packs do not become one 10,000 mAh pack for an airline’s allowance. Our listed Southwest and Emirates policies allow one power bank per passenger, so two small packs can exceed the limit even though their combined energy is low.
Which number should I check on a wireless pack?
Look for the battery’s Wh rating and nominal voltage, not the wireless charging output in watts. At 3.85 V, 5,000 mAh calculates to 19.25 Wh. Both examples are below 100 Wh, but a missing label, recall or route certification requirement can still prevent acceptance.
How many Wh is 5,000 mAh?
At 3.7 V it is 18.5 Wh. Use the actual nominal battery voltage to calculate your device’s rating.
Can a 5,000 mAh power bank go in checked luggage?
No. Power banks must stay in the cabin regardless of capacity.