Battery banks are allowed on planes, but only in your carry-on bag

You can bring a portable battery bank (also called a power bank) on a commercial flight in the United States, but it must go in your carry-on bag, not your checked luggage. The TSA allows one or two battery banks per person, depending on their capacity. Battery banks larger than 100 watt-hours (Wh) are prohibited entirely. Most standard phone chargers fall well under this limit — a typical 20,000 mAh battery bank is around 74 Wh.

The reason for this rule is fire safety. Lithium-ion batteries, which power most modern battery banks, can overheat and catch fire if damaged or short-circuited. Checked luggage is not monitored during flight, so the TSA keeps these batteries in the passenger cabin where crew can respond to a fire. Carry-on placement also means you can monitor your device and notice if it becomes unusually hot.

Different airlines may have stricter rules than the TSA baseline, so check your specific carrier's website before you pack. Some airlines limit you to one battery bank or require you to declare it at check-in, even though it goes in your carry-on.

Key Takeaways

  • Battery banks must be packed in your carry-on bag; they are prohibited in checked luggage on all U.S. flights.
  • The TSA allows up to two battery banks per person if each is 100 watt-hours or smaller; most phone chargers are well under this limit.
  • You do not need to remove the battery bank from your bag at security, but you should be prepared to show it if asked.
  • Airlines may have their own rules beyond the TSA minimum, so verify with your carrier before traveling.

How to check your battery bank's watt-hour rating

The watt-hour capacity is usually printed on the battery bank itself or in the product manual. Look for a label that says "Wh" or "mAh" (milliamp-hours). If you only see mAh, you can convert it roughly: divide the mAh number by 1000, then multiply by the voltage (usually 3.7V for lithium batteries). For example, a 20,000 mAh battery bank at 3.7V is approximately 74 Wh, which is under the 100 Wh limit.

If you cannot find the rating on your device or packaging, contact the manufacturer or check the product page where you bought it. Do not guess — bringing an oversized battery bank can result in confiscation at security and may delay your travel.

What happens if your battery bank exceeds the limit

If TSA officers discover a battery bank larger than 100 Wh in your carry-on, they will confiscate it. You will not be reimbursed, and you cannot retrieve it after you pass through security. There is no appeal process for confiscated items at the checkpoint.

If you attempt to pack an oversized battery bank in checked luggage, it may be discovered during baggage screening. The airline can refuse to load your bag onto the plane, which means your luggage does not travel with you. In rare cases, the entire flight can be delayed while the bag is removed and the battery is handled by hazmat personnel.

Spare batteries and battery packs that are not attached to devices

Loose lithium batteries — batteries not installed in a device — have stricter rules. You can bring up to two spare lithium batteries in your carry-on if each is 100 Wh or smaller. They must be in their original retail packaging or have tape over the terminals to prevent short circuits. Spare batteries are prohibited in checked luggage entirely.

This rule applies to replacement batteries for cameras, laptops, or other electronics. If you are traveling with a spare battery for your phone or camera, pack it in your carry-on with the terminals taped.

International flights and different country rules

If you are flying internationally, the rules may be stricter than U.S. domestic rules. The International Air Transport Association (IATA) sets guidelines that most airlines follow, but individual countries can impose their own restrictions. Some countries prohibit battery banks entirely or allow only one per person.

Check with your airline and the aviation authority of your destination country before you travel. Rules for flights departing from the United States may differ from rules for flights departing from other countries, even if you are flying the same route.

What to do if you forget about a battery bank in your checked bag

If you realize after check-in that you packed a battery bank in your checked luggage, tell a gate agent or airline representative immediately. Do not board the plane. The airline can remove your bag from the aircraft before departure, retrieve the battery bank, and allow you to either repack it in your carry-on or leave it behind. This is much simpler than having your bag removed after it has been loaded.

If your bag has already been loaded and you mention the battery bank, the flight may be delayed while ground crew locate and remove your luggage. Reporting the error before boarding prevents this disruption.

Frequently Asked Questions

Do I need to tell TSA about my battery bank at security?

No, you do not need to declare it. Battery banks do not require special notification at the checkpoint. However, if an officer asks about it, be honest and show them the device. Attempting to hide it can result in confiscation and may affect your ability to travel.

Can I bring a battery bank on a connecting flight?

Yes, as long as it remains in your carry-on throughout your journey. If you check your bag for a connection, the battery bank must stay with you. Some travelers move the battery bank to their carry-on specifically for connections to avoid any confusion with baggage handlers.

What if my battery bank gets hot during the flight?

Tell a flight attendant immediately. Do not try to cool it down yourself or put it in water. The crew has procedures for handling overheating batteries and will move you and your device to a safe location if needed. Reporting it early prevents a larger problem.

Are solar chargers and hand-crank chargers allowed?

Solar chargers and hand-crank chargers without built-in lithium batteries are allowed in both carry-on and checked luggage. If they have an internal battery, the same rules apply — the battery must be 100 Wh or smaller and must travel in your carry-on.

Can I bring multiple battery banks if they are small?

Yes. The TSA allows up to two battery banks per person in your carry-on, as long as each is 100 Wh or smaller. If you are traveling with a companion, they can also bring two battery banks. Pack them loose in your carry-on or in a small bag so they are easy to remove if an officer asks to inspect them.