Yes, a 20,000 mAh power bank is allowed on flights. At the standard 3.7V battery voltage, 20,000 mAh equals 74 Wh — well under the universal 100 Wh carry-on limit set by IATA and enforced by every major airline in the world.
This is the most common question we get, and the answer is simple: pack it in your carry-on bag and you will not have any problems. This guide explains why, what to watch out for, and whether the recent airline rule changes in 2025–2026 affect you.
The Calculation
74 Wh is safely under every airline's 100 Wh threshold. No airline approval is needed. You can bring up to 2 power banks of this size on most carriers — that is 2 × 74 Wh = 148 Wh of total portable power in your carry-on, all completely within the rules.
Is My Specific 20,000 mAh Power Bank Definitely 74 Wh?
Almost certainly, yes — but check your label. Most consumer power banks use standard lithium-ion cells at 3.6V to 3.7V nominal voltage. A small number of premium devices use higher-voltage cells (3.85V), which would put 20,000 mAh at 77 Wh — still safely under the limit.
If your power bank prints the Wh figure directly on the label, use that. Common 20,000 mAh models and their actual labelled Wh values:
- Anker 737 (24,000 mAh) — 87 Wh on the label
- Mophie Powerstation Pro (20,000 mAh) — 74 Wh on the label
- Xiaomi 20000 (20,000 mAh) — 74 Wh on the label
- Baseus 20K (20,000 mAh) — 74 Wh on the label
If your device does not print Wh, you can use our calculator on the homepage — enter 20000 mAh and it will show 74 Wh instantly.
Do Any Recent Rule Changes Affect Me?
Yes — several airlines introduced new restrictions in 2025 and 2026. None of them prevent you from carrying a 20,000 mAh power bank, but some affect whether you can use it during the flight:
- Lufthansa, Swiss, Austrian (Jan 2026): You can bring your 20,000 mAh bank on board, but you cannot use it during the flight. It must stay switched off. Lufthansa Group announcement
- Singapore Airlines (Apr 2025): Same — you can carry it, but it must be off and in your bag throughout the flight. Singapore Airlines advisory
- South Korean carriers: Your power bank must be kept visible and within reach of cabin crew — not in an overhead bin. Store it under the seat in front of you. Korea JoongAng Daily
- China domestic flights: Your power bank needs a CCC certification mark. Most internationally sold name-brand devices have this, but if yours was purchased from an unverified seller, check the label. CAAC notice
- Most other airlines (US, UK, Europe, Australia): No change. A 20,000 mAh power bank can be used normally during the flight.
Can I Bring Two 20,000 mAh Power Banks?
Yes, on almost all airlines. The standard rule is that you can carry up to 2 power banks under 100 Wh per passenger without any approval. Some airlines such as Emirates and flydubai have reduced this to 1 unit regardless of size — always check your specific carrier if you are unsure.
What If Security Questions It?
Security staff occasionally flag power banks for inspection, especially in China and India. If this happens:
- Stay calm. It is usually a routine check, not a seizure.
- Show them the label. If it shows 20,000 mAh or 74 Wh, you are within the rules.
- If they want a Wh calculation, the formula is: mAh × 3.7 ÷ 1,000 = 74 Wh. Most officers accept this.
- Original packaging with specifications printed on it helps if available.
Bottom line: A 20,000 mAh power bank is one of the most travel-friendly sizes you can buy. It is allowed everywhere, on every airline, without any prior approval. Just keep it in your carry-on and you are set.
Sources: IATA Lithium Battery Guidance · FAA Pack Safe · TSA