Lithium batteries exceeding 160 watt-hours aren’t allowed in carry-on or checked baggage; lithium metal batteries over 2 grams of lithium and spare lithium-ion batteries over 100 watt-hours are also banned
What batteries are not allowed on airplanes?
Car and wet/spillable batteries are prohibited in both carry-on and checked baggage unless used to power mobility devices; spare lithium metal or lithium-ion batteries are banned from checked luggage
Car batteries and similar wet/spillable types won’t fly in any luggage except when installed in an approved mobility scooter or wheelchair. Spare lithium batteries—including lithium metal and lithium-ion/polymer—can’t go in checked bags at all, thanks to their fire risk. These rules apply across all major airlines and are enforced by the FAA and ICAO.
Why can’t you take lithium batteries on a plane?
Lithium batteries pose a serious fire risk due to thermal runaway, which can cause intense, difficult-to-extinguish fires and explosions
They overheat fast, short-circuit easily, and can ignite almost instantly—fires that aircraft systems often can’t put out. The FAA has documented lithium battery fires in cargo holds leading to catastrophic outcomes, which is why spares must stay in carry-ons. Even installed batteries need protection from damage and shorts.
What size battery can I take on a plane?
Lithium batteries up to 100 watt-hours are allowed in carry-on baggage; with airline approval, you may carry up to two spares between 101–160 watt-hours or one spare up to 300 watt-hours
Most consumer gadgets—like cameras and laptops—use batteries under 100 Wh. Larger packs, such as extended laptop batteries, need airline sign-off and must fly in carry-ons. Policies can vary slightly by airline, so always double-check before you pack.
Are you allowed to take AA batteries on a plane?
Standard alkaline AA batteries are allowed in both carry-on and checked baggage; lithium AA batteries are permitted in carry-on only and must not exceed 100 watt-hours
Household alkaline AAs, AAAs, Cs, Ds, and 9-volts have no restrictions and are safe in any bag. Consumer lithium AAs, though, must stay in carry-ons and can’t exceed 100 Wh. Tape the terminals or use a battery case to prevent accidental shorts—it’s a simple step that saves headaches at security.
Can you travel on a plane with a lithium battery?
Yes, but only in carry-on baggage; spare lithium batteries must never be packed in checked luggage
Lithium batteries installed in devices—like phones or laptops—can go in either bag. Spare or uninstalled lithium batteries must stay in the cabin with you. Protect them from damage and secure the terminals; this includes vaping devices and power banks.
What happens if you accidentally check a lithium battery?
Checked bags aren’t screened specifically for lithium batteries; a lithium battery left in checked luggage will travel with your bag unless detected during manual inspection
Screening looks at overall security, not individual batteries. If one turns up in checked baggage, airlines will usually pull it for safe handling or even deny boarding. Some airlines now ban “smart bags” with non-removable lithium batteries from checked luggage as an extra precaution.
What size lithium battery can I take on a plane?
With airline approval, you may carry up to two spare lithium-ion batteries between 101–160 watt-hours or one spare up to 300 watt-hours; lithium metal batteries with 2–8 grams of lithium are also permitted
These larger batteries often power extended laptop packs, professional video gear, and some power tools. Always declare them at security and keep them in carry-ons. Each airline sets its own limits, so verify your carrier’s policy before you fly.
What are the chances of a lithium battery exploding?
Lithium-ion battery failures are rare, with a failure rate of less than one in a million
While the odds are slim, failures can happen from drops, overheating, or factory defects. For comparison, the NOAA puts lightning strike odds at about 1 in 13,000 over a lifetime—far higher than typical lithium battery failure rates. Sticking with reputable brands and handling batteries carefully cuts the risk even further.
What is a 100 watt-hour battery?
A 100 watt-hour battery can deliver 100 watts for one hour, or proportionally less power over longer durations (e.g., 20 watts for 5 hours)
Watt-hours measure capacity: a 100 Wh battery packs more punch than a 50 Wh model. Airlines use this unit for lithium battery limits, and you’ll see it on most laptop and power bank labels. To calculate, multiply voltage (V) by amp-hours (Ah), or divide watt-hours by voltage to find amp-hours.
How do I carry batteries on a plane?
Lithium batteries must be carried in carry-on baggage only; spare lithium-ion batteries cannot exceed 100 watt-hours, and lithium metal batteries must not exceed 2 grams of lithium
Install batteries in devices when possible; spares need individual protection to prevent shorts. Use a battery case, tape over terminals, or slip each battery into a separate plastic bag. Never toss lithium batteries loose in luggage or near metal objects that could trigger a contact short.
Can you carry a battery pack on plane?
Portable battery packs containing lithium-ion cells can only be carried in carry-on baggage; with airline approval, you may bring up to two spare packs between 101–160 watt-hours
Power banks and external chargers follow the same lithium rules as single cells. They can’t go in checked luggage and must be accessible for security checks. Some airlines restrict larger power banks entirely, so check your carrier’s policy before packing.
Is toothpaste considered a liquid?
Yes, toothpaste is classified as a gel and falls under liquid restrictions when over 3.4 ounces (100 ml)
All gels, pastes, and liquids—including toothpaste, lotions, and shampoos—must fit in a single 1-quart zip-top bag and stay under 3.4 ounces per container. Solid toothpaste tablets skip this rule entirely. The TSA occasionally updates policies, so glance at their site before you pack.
Can toys with batteries be checked in baggage?
Battery-operated toys using standard non-rechargeable batteries (AA, AAA, etc.) are allowed in checked or carry-on bags; toys with lithium or rechargeable batteries must be carried in cabin
Remove batteries from toys if storing long-term to avoid corrosion. Lithium-powered toys—including remote-control vehicles with Li-ion packs—must fly in carry-ons. Skip flying with damaged or recalled battery toys altogether.
Can you bring snacks on a plane?
Solid snacks are allowed in both carry-on and checked baggage; liquids, gels, and powders over 12 ounces may face additional screening
Pack snacks in clear bags for quick inspection; powders like flour or sugar over 12 oz can trigger extra screening delays. Fresh fruits and veggies may hit restrictions on international flights—check CBP or USDA guidelines before you head to the airport.
