Can You Take Portable Chargers on a Plane? 2026 Guide

If you’re packing for a flight and wondering, “Can you take portable chargers on a plane?”, you’re not alone. With power banks now a travel essential, it’s easy to forget they’re subject to strict airline and battery safety rules.

This guide breaks down the newest rules for portable chargers on a plan, how to calculate charger capacity correctly, and how to choose a size that works for your travel needs. Before you zip up your hand luggage, make sure your charger won’t land you in trouble at security.

2026 Update for UK Travellers

If you are flying in 2026, the practical rule is now stricter than many older travel guides suggest. ICAO introduced updated power-bank restrictions effective 27 March 2026, and IATA’s revised passenger guidance says travellers should carry no more than two power banks, each 100Wh or less, must not recharge them during the flight, and should avoid storing them in overhead lockers.

So if you want the simplest possible takeaway, it is this:

• Keep portable chargers in carry-on only.
• Bring no more than two power banks.
• Make sure each is 100Wh or less.
• Do not recharge them onboard.

What Changes on International Trips?

If you’re travelling internationally, assume the stricter 2026 baseline applies unless your airline clearly says otherwise. For passengers, that means:

• Carry-on only.
• Maximum two power banks.
• Each 100Wh or less.
• No recharging during the flight.
• Keep them accessible rather than in the overhead locker.

Some airlines or countries may apply even stricter handling rules, especially on international or connecting itineraries. UK government guidance also makes clear that airlines may set their own restrictions, so passengers should always check the operating carrier’s latest page before travel.

Formula for Calculating Portable Charger Capacity

You see, when asking, “Can you take portable chargers on planes?” one key thing airlines look at is the battery’s watt-hour (Wh) rating. That’s because Wh measures total stored energy—the thing that matters for fire safety—while milliamp-hours (mAh) only measures charge.

Most modern power banks will have the Wh rating printed on the label. But if it only shows mAh, no worries—you can easily convert it to Wh with this quick formula:

Wh = (mAh ÷ 1000) × Voltage (V)

The V here is the battery’s nominal voltage, not the USB output voltage (like 5V or 9V for fast charging). Most lithium-ion power banks use batteries with 3.7V nominal voltage but check your device’s label to be sure—some are 3.6V, 3.85V, or higher depending on the internal cells.

Here are a few real-world examples:

• 10,000 mAh at 3.7V→ 37 Wh. Calculation: 10,000 ÷ 1000 × 3.7 = 37. This sits well under the common 100 Wh threshold.
• 20,000 mAh at 3.7V→ 74 Wh. A popular “weekend” size, also under 100 Wh.
• 26,800 mAh at 3.7V→ ~99 Wh. This maximises capacity while staying below 100 Wh on most airlines.

How to Choose the Right Portable Charger Size for Your Needs

When picking a power bank for flying, think about battery size, device needs, and airport simplicity.

Choose 100Wh or less

For air travel, the safest choice is a power bank that is 100Wh or less and clearly labelled. That keeps you within the latest passenger guidance and makes airline checks easier.

Think about how much charge you actually need

Here’s the thing: you don’t get 100% of your power bank’s energy to your phone. Between voltage conversion and general inefficiency, you’ll get about 60–70% of its total energy in real use.

To put things into perspective:

A 10,000 mAh power bank with an average efficiency of 65% gives you about 6,500 mAh of usable power. If you’re charging an iPhone 15, which has a 3,350 mAh battery, that’s nearly two full charges.

6,500 ÷ 3,350 ≈ 1.9 full charges

Now, compare that to a 20,000 mAh power bank. At the same 65% efficiency, it offers roughly 13,000 mAh of usable power. If you’re charging a Galaxy S23 Ultra with a 5,000 mAh battery, you’ll get around 2.6 full charges.

13,000 ÷ 5,000 ≈ 2.6 full charges

Match your output power to your devices

It’s not just about capacity—output wattage matters too. Phones are happy with 20–30W USB-C PD. Tablets need closer to 30W+. Laptops? They usually want 45–65W or more. If you’re trying to power a MacBook or similar, make sure your portable charger can keep up.

What Portable Chargers Should You Consider?

If you want a power bank that works well for travel, it makes sense to choose one that combines a flight-friendly size with enough output for your usual devices. Below is a curated list of recommended portables battery chargers for flying.

For day trips or short flights

A 10,000 mAh (around 37 Wh) charger is ideal if you just need to top up your phone once or twice on the go. It’s compact, easy to carry, and hassle-free at airport security.

If you want to skip the cables entirely, consider a portable wireless charging power bank, perfect for charging while you scroll, especially in a cramped seat.

The Anker MagGo Power Bank (10K) is a great fit here. It offers 15W magnetic wireless charging with Qi2 certification, so it’s fully compatible with MagSafe on iPhones. You can just snap it on the back of your phone and go.

There’s also a 27W USB-C port for fast wired charging, or to top up the power bank quickly when you land.

What makes it extra handy is the smart display that shows your battery percentage and estimated time remaining, plus a fold-out stand, so you can watch or scroll while charging. The total capacity clocks in at 10,000 mAh (37 Wh), with a compact build that easily slips into a jacket pocket—about 107×69×20 mm and 250g.

For weekend breaks or long travel days

If you’ll be out all day—or away for a few—step up to 20,000 mAh (about 74 Wh). That’s enough to charge most phones 2 to 4 times, or a phone plus a tablet. It stays under the 100 Wh threshold for air travel, so you won’t need airline approval to pack it.

The Anker Prime 20,000mAh Power Bank (200W) gives you plenty of flexibility. It supports up to 200W total output across two USB-C ports and one USB-A, with up to 100W from a single USB-C port. That’s more than enough to fast-charge laptops, tablets, or multiple phones at once. It also supports 100W recharging, so you can refill it fast (around 75 minutes with a high-wattage wall charger).

What Not to Do Onboard

Even if your portable charger is allowed in the cabin, there are still a few things you should avoid once you board.

Do not recharge the power bank during the flight

ICAO’s March 2026 update introduced a ban on recharging power banks during flight, and IATA’s updated guidance reflects that change. That means you should not plug the power bank itself into onboard USB or seat power.

Do not put it in the overhead locker

IATA’s passenger guidance says power banks should not be stored in overhead lockers. Keep them in your personal item or another accessible place in the cabin instead.

Do not leave it in a bag that may be gate-checked

If airline staff take your larger cabin bag and place it in the hold, remove the power bank first. British Airways explicitly says spare batteries and power packs are not permitted in checked baggage under any circumstances.

Conclusion

So, can you take portable battery chargers on a plane? Yes, you can take a portable charger on a plane, but in 2026 the safest rule is simple: keep it in carry-on only, travel with no more than two, make sure each is 100Wh or less, and do not recharge it during the flight. It is also best to keep it somewhere easy to reach, rather than in an overhead locker or a bag that might end up in the hold. Still unsure? Always double-check with your airline—it’s better than handing over your charger at security.

FAQs

Can you use a portable charger during the flight?

The updated 2026 guidance says you should not recharge the power bank during the flight. Some airlines may also restrict when it can be used to charge other devices, so always follow crew instructions and your airline’s latest rules.

How can I check the watt-hour rating of my charger?

You can find the watt‑hour (Wh) rating printed on the portable charger label or in the documentation. If it’s not listed, estimate it using: Wh = (mAh × Voltage) ÷ 1,000. Most lithium‑ion power banks use around 3.7V nominal voltage. For example, a 10,000 mAh power bank at 3.7V is about 37 Wh.