Can you bring a 40,000 mAh power bank on a plane?

Usually not. A 40,000 mAh power bank is about 148 Wh at 3.7 V. That’s over 100 Wh: 12 of 31 airlines allow it only with their approval, and 19 don’t allow it at all.

Rules checked on 21 October 2026 · 31 airlines.

40,000 mAh in Wh

Capacity at 3.7 V

148 Wh

40,000 mAh × 3.7 V ÷ 1000 = 148 Wh · in the 100–160 Wh approval band

Most power banks use 3.7 V cells. If your label shows another voltage (often 3.6–3.85 V) or a Wh number, check with that — the checker does the math.

Check your 40,000 mAh power bank

Capacity

mAh

Voltage

Both numbers are printed on the label. Not sure about volts? Leave 3.7 V — it’s the standard.Both are on the label. Not sure about volts? Leave 3.7 V.

Airline

How many?

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40,000 mAh (148 Wh) by airline

Airline	1 power bank of 148 Wh	Why
Air Canada	With approval	Ask Air Canada for approval first. Max 2 per person.
Air China	With approval	Ask Air China for approval first. Max 2 per person.
Air France	With approval	Ask Air France for approval first. Max 2 per person.
Air India	Not allowed	Over Air India’s 100 Wh limit.
Alaska Airlines	Not allowed	Over Alaska Airlines’s 100 Wh limit.
American Airlines	Not allowed	Over American Airlines’s 100 Wh limit.
ANA	Not allowed	Over 100 Wh, and ANA doesn’t state an approval route.
British Airways	Not allowed	Over British Airways’s 100 Wh limit.
Cathay Pacific	With approval	Max 2 per person. Cathay Pacific: Approval for 100-160Wh only on departures from South Korea.
China Eastern Airlines	With approval	Ask China Eastern Airlines for approval first. Max 2 per person.
China Southern Airlines	With approval	Ask China Southern Airlines for approval first. Max 2 per person.
Delta Air Lines	Not allowed	Over Delta Air Lines’s 100 Wh limit.
easyJet	Not allowed	Over 100 Wh, and easyJet doesn’t state an approval route.
El Al	Not allowed	Over El Al’s 100 Wh limit.
Emirates	Not allowed	Over Emirates’s 100 Wh limit.
Etihad Airways	Not allowed	Over Etihad Airways’s 100 Wh limit.
IndiGo	With approval	Ask IndiGo for approval first. Max 2 per person.
Japan Airlines	Not allowed	Over 100 Wh, and Japan Airlines doesn’t state an approval route.
JetBlue	Not allowed	Over JetBlue’s 100 Wh limit.
KLM	With approval	Ask KLM for approval first. Max 2 per person.
Korean Air	Not allowed	Over 100 Wh, and Korean Air doesn’t state an approval route.
LATAM Airlines	Not allowed	Over LATAM Airlines’s 100 Wh limit.
Lufthansa	With approval	Ask Lufthansa for approval first. Max 2 per person.
Qantas	With approval	Ask Qantas for approval first. Max 2 per person.
Qatar Airways	Not allowed	Over Qatar Airways’s 100 Wh limit.
Ryanair	Not allowed	Over Ryanair’s 100 Wh limit.
Singapore Airlines	With approval	Ask Singapore Airlines for approval first. Max 2 per person.
Southwest Airlines	Not allowed	Over Southwest Airlines’s 100 Wh limit.
Turkish Airlines	Not allowed	Over Turkish Airlines’s 100 Wh limit.
United Airlines	With approval	Ask United Airlines for approval first. Max 2 per person.
Wizz Air	Not allowed	Over Wizz Air’s 100 Wh limit.

Each verdict comes from the airline’s own page and the worldwide rules, for one power bank. Open an airline for the source.

40,000 mAh power bank questions

How many Wh is a 40,000 mAh power bank?

About 148 Wh at 3.7 V: 40,000 × 3.7 ÷ 1000 = 148 Wh. If the label shows a different voltage or a Wh number, use that.

Can a 40,000 mAh power bank go in checked luggage?

No. Power banks are carry-on only, on every airline we track.

Can I bring two 40,000 mAh power banks?

Only on airlines that approve 100–160 Wh power banks, and then at most 2 per person.