Most batteries are banned from checked bags, but some common ones are allowed

The short answer: lithium batteries are prohibited in checked luggage, but alkaline batteries (AA, AAA, C, D, 9V) are allowed. The rule exists because lithium batteries can overheat and catch fire in the cargo hold, where fires cannot be fought during flight. The Transportation Security Administration (TSA) enforces these rules for all U.S. flights, and most international carriers follow similar restrictions.

The distinction matters because many modern devices use lithium batteries—phones, laptops, power banks, e-readers, and cameras all contain them. If you pack these in checked luggage, they will be confiscated at the checkpoint, and you will not get them back. Packing them in carry-on luggage is permitted under TSA rules, though individual airlines may have stricter limits.

Key Takeaways

  • Alkaline batteries (AA, AAA, C, D, 9V) are allowed in checked luggage with no quantity limit.
  • Lithium batteries of any kind—including those in phones, laptops, and power banks—are prohibited in checked bags.
  • Lithium batteries are allowed in carry-on luggage, but you are limited to two spare lithium batteries per device type.
  • Batteries must not be damaged, short-circuited, or leaking, or they will be refused regardless of type.
  • International flights may have stricter rules than domestic U.S. flights, so check your airline's policy before packing.

Which batteries are allowed in checked luggage

Alkaline batteries are the only consumer batteries permitted in checked bags. This includes standard AA, AAA, C, D, and 9V batteries used in flashlights, remote controls, and other household devices. You can pack as many alkaline batteries as you need in checked luggage with no TSA restrictions. They must be in their original packaging or have the terminals taped to prevent short circuits, but this is a practical precaution rather than a strict rule.

Alkaline batteries are safe in cargo holds because they do not contain the reactive lithium compounds that can ignite under pressure or temperature changes. If you are packing devices that run on alkaline batteries—a portable radio, a flashlight, a toy—you can include spare batteries in your checked bag without issue.

Why lithium batteries are prohibited in checked bags

Lithium batteries are banned from checked luggage because they pose a fire risk in the cargo hold. If a lithium battery is damaged, defective, or short-circuited, it can enter a state called thermal runaway—a chain reaction where the battery overheats and ignites. In the pressurized, unmonitored cargo hold of an aircraft, a fire cannot be detected or fought by crew members, making it a serious safety hazard.

This rule applies to all lithium batteries, including those built into devices. A smartphone, laptop, tablet, power bank, e-reader, smartwatch, or camera contains a lithium-ion or lithium-polymer battery. Even if the device is powered off, the battery inside still poses a risk. The TSA and Federal Aviation Administration (FAA) treat these as prohibited items in checked bags, period.

The rule does not mean lithium batteries are unsafe to fly with—they are allowed in carry-on luggage where crew can respond to a fire. It means they must be in the cabin where they can be monitored and managed if something goes wrong.

Lithium batteries in carry-on luggage

You may pack lithium batteries in your carry-on bag. The TSA allows two spare lithium batteries per device type—for example, two spare batteries for a camera and two for a laptop—as long as they are in their original retail packaging or have the terminals taped. Devices with built-in lithium batteries (phones, laptops, tablets) are allowed in carry-on with no quantity limit.

If you are traveling with a laptop, phone, and camera, all three can go in your carry-on. You can also bring two spare batteries for each device. This is the standard way to travel with electronics: keep them with you in the cabin rather than in checked luggage.

How to pack batteries safely for air travel

For alkaline batteries in checked luggage, keep them in their original packaging if possible. If you have loose batteries, tape the positive and negative terminals with clear or duct tape to prevent accidental contact with metal objects that could cause a short circuit. Place them in a small bag or container so they do not roll around in your suitcase.

For lithium batteries in carry-on luggage, follow the same rule: original packaging is best, or tape the terminals. Do not pack damaged, leaking, or recalled batteries of any kind. If a battery looks swollen, corroded, or has visible damage, leave it behind or dispose of it properly at home.

Keep lithium batteries separate from metal objects in your carry-on. A battery touching a key, coin, or metal zipper can short-circuit and overheat. This is rare but possible, and the separation takes seconds.

What happens if you pack prohibited batteries in checked luggage

If TSA screening detects a lithium battery in your checked bag, the battery or device will be confiscated and not returned to you. You will not be refunded, and you will not be able to retrieve it after your flight. The item is removed from your luggage before it is loaded onto the aircraft.

In some cases, if a lithium battery is discovered after the bag is already loaded, the entire flight may be delayed while the bag is located and the battery is removed. This can affect other passengers and result in significant delays. The best approach is to check your bag before you leave home and move any devices or spare lithium batteries to your carry-on.

International flights and airline-specific rules

International carriers may have stricter rules than the TSA. Some airlines prohibit lithium batteries in carry-on luggage entirely, or limit the number of devices you can bring. Before you book or pack, check your airline's website for their specific battery policy. Airlines like British Airways, Air Canada, and others have their own rules that may differ from TSA guidelines.

If you are flying internationally, assume the strictest rule applies: pack all lithium batteries in carry-on luggage, keep them in original packaging, and tape the terminals. Some countries also have restrictions on importing certain battery types, so if you are traveling with expensive electronics, research the destination country's rules as well.

Frequently Asked Questions

Can I pack a phone or laptop in checked luggage?

No. Phones and laptops contain lithium batteries and are prohibited in checked bags. Keep them in your carry-on. If you must pack a device in checked luggage, remove the battery first—though most modern devices have non-removable batteries, so this is usually not an option.

Are power banks allowed in checked luggage?

No. Power banks contain lithium batteries and are prohibited in checked bags. They must go in your carry-on. This applies to all portable chargers and external battery packs, regardless of capacity.

What if my battery is damaged or swollen?

Do not pack it at all. A damaged or swollen battery is a fire hazard and will be refused by TSA or your airline. Dispose of it properly at a battery recycling center or electronics store before you travel.

Can I pack rechargeable batteries in checked luggage?

Only if they are alkaline-based rechargeable batteries, which are rare. Most rechargeable batteries are lithium-ion and are prohibited in checked bags. If you are unsure, assume it is lithium and pack it in carry-on instead.

Do I need to declare batteries to TSA?

No formal declaration is required, but TSA screening will detect them. If you are packing alkaline batteries in checked luggage, you do not need to tell anyone. If you are packing lithium batteries in carry-on, they will be screened like any other item—no special announcement needed.