Can I Bring a 20000mAh Power Bank on Icelandair Flights to Reykjavik?

Updated 2026-07-28 · Power Bank Guide

Traveling to Reykjavik with a 20000mAh power bank Icelandair policy in mind? The short answer is yes—provided the battery meets the FAA’s 100 Wh limit and you keep it in your carry‑on. Below we break down the math, the TSA/FAA rules, and how Icelandair’s own policy aligns with other major carriers. We also recommend a flight‑safe option: the INIU 20000mAh Portable Charger.

Understanding the 100 Wh Limit

The Federal Aviation Administration (FAA) caps portable lithium‑ion batteries at 100 watt‑hours (Wh) for carry‑on luggage. Anything above 100 Wh must be approved by the airline and is generally prohibited in checked baggage because of fire risk.

To convert a milliamp‑hour rating to watt‑hours, use the formula:

Wh = (mAh ÷ 1,000) × Voltage. Most power banks use a nominal 3.7 V lithium‑ion cell.

For a 20000 mAh pack:

• 20000 mAh ÷ 1,000 = 20 Ah
• 20 Ah × 3.7 V ≈ 74 Wh

At roughly 74 Wh, the bank is comfortably under the 100 Wh ceiling, so it can be taken on board as a carry‑on item. It is still prohibited in checked luggage.

What Icelandair Says About Power Banks

Icelandair follows the same FAA guidelines that apply to all U.S. carriers. Their public policy states:

• All lithium‑ion batteries must be under 100 Wh.
• They must be carried in the passenger cabin, not in checked baggage.
• Passengers may bring any number of batteries under 100 Wh, but the crew can request that you turn them off during take‑off and landing.

Because a 20000 mAh (~74 Wh) power bank meets these criteria, Icelandair will allow it on flights to Reykjavik. As always, confirm with the airline before departure, especially if you’re traveling with multiple large power banks.

Real‑World Charge Capacity

Battery capacity is never 100 % efficient when converting to a phone’s internal battery. Typical conversion losses range from 30‑40 % due to voltage regulation and heat. Assuming a 70 % efficiency, a 20000 mAh (74 Wh) pack can deliver about 52 Wh of usable energy.

Here’s how many full charges you can expect for popular smartphones (using their typical battery sizes):

• iPhone 17 (≈3,200 mAh, 12 Wh): ~4‑5 full charges.
• Samsung Galaxy S24 (≈4,800 mAh, 18 Wh): ~2‑3 full charges.
• Google Pixel 8 (≈5,000 mAh, 19 Wh): ~2‑3 full charges.
• Xiaomi 13 (≈5,000 mAh, 19 Wh): ~2‑3 full charges.

These numbers will vary with screen brightness, background apps, and whether you’re using fast‑charge protocols.

USB‑C Power Delivery and Fast Charging

The INIU 20000mAh Portable Charger (Flight‑Safe) supports 22.5 W USB‑C Power Delivery. At 22.5 W, a compatible phone (e.g., iPhone 17 with 20 W PD) will charge from 0 % to 50 % in roughly 30 minutes. Larger phones that accept 30 W or more will still charge, just a bit slower, because the charger caps out at 22.5 W.When you’re on a long flight, a quick top‑up can be more valuable than a full charge. Keep in mind that the charger’s output drops slightly as the internal battery depletes, but it stays well above the 5 W baseline needed for most devices.

Airline‑by‑Airline Snapshot

While Icelandair aligns with FAA rules, other carriers have slightly different wording. The following table shows the typical stance for major airlines on a 20000 mAh power bank:

All of these airlines follow the same 100 Wh ceiling, so a 20000 mAh bank is universally permissible as long as you keep it in the cabin.

Practical Tips for Flying with a 20000mAh Power Bank

• Pack it in your personal item or carry‑on. TSA agents will likely ask to see the battery rating; having the spec sheet handy speeds the process.
• Turn it off during take‑off and landing. Some airlines request that all electronic devices be powered down, including power banks.
• Bring a USB‑C to USB‑C cable. The INIU model includes a high‑quality cable, which eliminates the need to buy an extra one.
• Check local regulations. Some countries (e.g., China) have stricter rules for lithium batteries; always verify before international connections.
• Know your device’s charging limits. If your phone only supports 5 W, the 22.5 W output will simply charge at the lower rate—no risk of over‑charging.

Following these steps ensures a smooth security experience and keeps your devices powered throughout the trip.

Why the INIU 20000mAh Portable Charger (Flight‑Safe) Is a Good Choice

If you need a reliable, airline‑approved power bank for your Icelandic adventure, the INIU 20000mAh Portable Charger checks every box. It’s under the 100 Wh limit, fits easily in a backpack, includes a USB‑C cable, and even has a built‑in flashlight for those midnight Northern‑lights hunts. Its 22.5 W fast‑charge capability works well with iPhone 17, Samsung, Xiaomi, and Google phones, giving you multiple top‑ups on a single flight.

FAQ

Can I bring more than one 20000mAh power bank on an Icelandair flight?

Yes, you can bring multiple batteries as long as each is under 100 Wh and all are carried in the cabin. However, airlines may limit the total number of spare batteries for safety reasons, so check with Icelandair if you plan to travel with several.

What happens if my power bank is over 100 Wh?

Batteries above 100 Wh require airline approval and may be refused for carry‑on. They are also prohibited in checked luggage. If you have a larger pack, contact the airline well in advance to request an exception, or consider using a smaller bank.

Do I need to declare my power bank at security?

In the U.S., TSA agents typically ask to see the battery’s capacity if it’s not obvious from the packaging. Having the specifications printed on the device or in a quick‑look PDF makes the process smoother, but you usually do not need a formal declaration.