Yes, portable chargers can go in carry-on luggage, but only if the battery is under 100 watt-hours

The TSA permits portable chargers (also called power banks) in your carry-on bag as long as they meet specific battery capacity limits. A portable charger with a battery rated under 100 watt-hours can travel in your carry-on without restriction. If your charger is between 100 and 160 watt-hours, you can bring it, but you are limited to one per person, and you must declare it to the airline. Chargers over 160 watt-hours are not permitted in carry-on or checked baggage on commercial flights.

The watt-hour rating is printed on the charger itself, usually on a label on the bottom or back. If you see "mAh" (milliamp-hours) instead, you can convert it roughly: multiply the mAh number by the voltage (usually 3.7 volts for lithium batteries) and divide by 1000. For example, a 20,000 mAh charger at 3.7V equals about 74 watt-hours, which is under the limit.

Key Takeaways

  • Portable chargers under 100 watt-hours go in carry-on with no declaration needed.
  • Chargers between 100 and 160 watt-hours are allowed in carry-on only if you declare them to the airline, and you can bring only one.
  • Chargers over 160 watt-hours cannot fly in carry-on or checked baggage.
  • The watt-hour rating is printed on the charger; if only mAh is listed, multiply by 3.7 and divide by 1000 to find watt-hours.
  • Checked baggage rules are stricter: only chargers under 100 watt-hours are allowed, and you can bring a maximum of two.

Why portable chargers have battery limits

The TSA restricts lithium batteries in carry-on and checked baggage because they can overheat and ignite if damaged or defective. A lithium battery fire in the cargo hold of an aircraft is harder to detect and control than one in the cabin, which is why the rules differ between carry-on and checked bags. The 100 watt-hour threshold is the point at which the TSA considers the fire risk acceptable for the cabin but not for cargo.

Portable chargers are treated as spare batteries under TSA rules, not as electronics. This means the restriction applies to the battery inside the charger, not to the charger itself. A charger with a non-lithium battery (rare, but they exist) would not be subject to these limits, though you should verify the battery type before packing.

How to find your charger's watt-hour rating

Look for a label on the back or bottom of your portable charger. The label will list specifications including capacity. You are looking for one of two numbers: watt-hours (Wh) or milliamp-hours (mAh). If the label shows watt-hours directly, that is your answer. Most chargers under 30,000 mAh will be under 100 watt-hours.

If you only see mAh and voltage, do the math: (mAh ÷ 1000) × voltage = watt-hours. For a 20,000 mAh charger at 3.7V: (20,000 ÷ 1000) × 3.7 = 74 watt-hours. If the label is worn or missing, contact the manufacturer with the model number, or check the product manual or the retailer's website where you bought it.

Some chargers list capacity in both units. A label might say "20,000 mAh / 74 Wh" — in that case, use the watt-hour number directly and skip the conversion.

Portable chargers in checked baggage

Checked baggage rules are stricter than carry-on rules. You can pack portable chargers in checked luggage only if they are under 100 watt-hours, and you can bring a maximum of two chargers per person. Chargers between 100 and 160 watt-hours are not allowed in checked bags at all, even with declaration.

Because checked baggage is not monitored during flight, the TSA takes a more conservative approach. If you are traveling with a larger charger, keep it in your carry-on and declare it to the airline at the gate. Do not try to pack it in checked luggage — it will be confiscated at security.

What to do if your charger exceeds the limit

If your portable charger is over 160 watt-hours, you cannot bring it on a commercial flight. Your options are to leave it at home, ship it to your destination separately, or purchase a smaller charger that meets TSA limits. Many travelers who rely on high-capacity chargers buy a second, smaller one just for air travel.

If your charger is between 100 and 160 watt-hours, pack it in your carry-on bag and declare it to the airline when you check in or at the gate. Some airlines require you to declare it in advance; others allow declaration at the airport. Call your airline before you travel to confirm their specific procedure. Do not pack it in checked baggage — it will be removed.

Declaring your charger to the airline

If your charger is between 100 and 160 watt-hours, you must tell the airline before or at the airport. When you check in online or at the counter, mention that you are traveling with a lithium battery charger and provide the watt-hour rating. At the gate, if you did not declare it online, tell the agent before boarding.

The airline will note it in your reservation and may ask to see the charger to verify the rating. Have the charger accessible and the watt-hour label visible. Declaration does not mean you will be denied travel — it means the airline documents that you have it and confirms it meets their policy. Different airlines may have slightly different procedures, so contact yours in advance if you are unsure.

Common mistakes to avoid

Do not assume a charger is under 100 watt-hours just because it is small. A compact 30,000 mAh charger can exceed the limit. Always check the label, even if the charger looks portable and lightweight. Do not pack a charger over 100 watt-hours in checked baggage — it will be confiscated, and you may face a fine.

Do not forget to declare a charger between 100 and 160 watt-hours. Failing to declare it can result in confiscation and may affect your ability to travel. If you are unsure of your charger's rating, contact the manufacturer or the airline before you pack. It takes five minutes and prevents problems at security.

Frequently Asked Questions

Can I bring multiple portable chargers under 100 watt-hours?

Yes. The TSA does not limit the number of chargers under 100 watt-hours in carry-on. However, checked baggage is limited to two chargers under 100 watt-hours per person. If you are packing multiple chargers, keep them in your carry-on to avoid the checked baggage limit.

What if my charger says mAh but no voltage?

Most lithium portable chargers use 3.7V, so you can assume that voltage for the conversion. Multiply the mAh by 3.7 and divide by 1000. If the charger is not lithium-based, contact the manufacturer. Non-lithium chargers may have different rules.

Do I need to turn off my portable charger before flying?

The TSA does not require you to turn off a portable charger, but it is a good practice to power it down before packing it. This reduces the risk of accidental set up during flight. You can turn it back on once you land.

Can I use my portable charger during the flight?

Most airlines allow you to use a portable charger to charge your phone or other devices during the flight, as long as the charger itself is not plugged into a wall outlet. Check with your airline about USB port availability and their specific policy on device charging.

What happens if I accidentally pack a charger over 160 watt-hours?

TSA security will confiscate it. You will not be able to bring it through security or board the flight with it. If you discover this before arriving at the airport, leave the charger at home or ship it separately. If you discover it at security, you will have to surrender it.