Can You Bring Lithium Batteries On The Plane? | TSA Rules

You pack the night before, toss the power bank in your checked suitcase, and head to the airport. At security, the agent pulls your bag aside. That moment — holding up the line while they dig out the battery — is avoidable.

The honest answer: yes, you can bring lithium batteries on a plane, but the rules about where they go and how to pack them are specific. Spare batteries belong in your carry-on. Devices containing batteries can go in either bag. The limits depend on watt-hours or grams of lithium, and the FAA and TSA have clear guidelines worth knowing before you fly.

Carry-On Only For Spare Batteries

The core rule is simple: loose lithium batteries — spares that are not installed in a device — must be carried in your carry-on baggage. Checked luggage is off-limits for these. The reason has to do with fire response. If a battery overheats in the cabin, the crew can reach it and put it out. In the cargo hold, a fire can spread before anyone notices.

This applies equally to lithium ion batteries (the rechargeable kind in phones, laptops, and power banks) and lithium metal batteries (the non-rechargeable kind in cameras and medical devices). Both types follow the carry-on requirement. The FAA’s carry-on baggage requirement spells this out clearly.

Devices with batteries already installed — like a laptop or smartphone — are fine in either carry-on or checked baggage. It’s the spare, uninstalled batteries that the rules target.

Why The Rules Are So Strict

It’s easy to assume these rules are random bureaucracy until you understand what can go wrong. Lithium batteries store a lot of energy in a small space. If a battery is damaged, short-circuited, or overheated, it can enter a state called thermal runaway — the battery heats up uncontrollably, releases flammable gas, and can catch fire. These fires are difficult to put out because the battery produces its own oxygen as it burns.

The FAA tracks incidents involving lithium batteries on aircraft. Smoke and fire events, though rare, do happen. That’s why the rules emphasize accessibility and why loose batteries must be protected from short circuits. Here’s what that looks like in practice:

• Keep batteries in original packaging: The plastic blister pack or cardboard box prevents loose terminals from touching metal objects in your bag.
• Tape the terminals: If you’ve thrown away the packaging, a strip of electrical or masking tape over the metal contacts does the same job.
• Use a battery case: Dedicated plastic cases for spare batteries are inexpensive and work well for travelers who carry multiple spares.
• Separate batteries from metal: Keys, coins, and other metal items in the same pocket can complete a circuit between the terminals and cause overheating.
• Inspect batteries before flying: If a battery is swollen, cracked, or leaking, don’t fly with it. Replace it before your trip.

The FAA has issued safety alerts for operators on handling these situations. Most incidents are preventable with proper packing.

Understanding Watt-Hours And Size Limits

Battery size matters for the rules. For lithium ion batteries, the key number is the watt-hour (Wh) rating. You’ll find it printed on the battery itself — often on a small label near the manufacturer’s information. Most consumer batteries fall well below the thresholds.

Lithium ion batteries up to 100 watt-hours are generally allowed in carry-on baggage without special approval. This covers virtually all laptop batteries, phone batteries, and standard power banks. A typical smartphone battery is around 10–15 Wh. A laptop battery is usually 40–80 Wh.

For larger batteries between 101 and 160 watt-hours, you may carry up to two spares, but you need airline approval before your flight. These are common in professional camera gear, larger power tools, and some medical devices. Contact your airline ahead of time to confirm. Batteries over 160 Wh are generally prohibited on passenger aircraft altogether.

If you’re not sure about your battery’s rating, check the manufacturer’s label or the device’s user manual. Many airlines also publish their policies online for quick reference.

Packing Batteries The Right Way

Getting through security smoothly comes down to a few preparation steps. Here’s a sequence that works for most travelers:

1. Check the watt-hour rating on every spare battery before you pack it. If you can’t find the rating, leave it at home — TSA may not let it through.
2. Protect the terminals with tape, original packaging, or a battery case. This prevents short circuits during the flight, which is the most common cause of battery incidents.
3. Keep spare batteries accessible in your carry-on. Don’t bury them at the bottom of a packed bag. Put them in an outer pocket or a pouch you can grab quickly.
4. Get airline approval in advance for batteries over 100 Wh (or 2 grams for lithium metal). Call or check your airline’s website before you arrive at the airport.
5. Inspect every battery for damage before your trip. Swelling, cracks, leaks, or a dented casing all mean the battery should not fly. Dispose of it properly at a battery recycling center.

A few minutes of prep at home saves the hassle of a bag search at the checkpoint. It also keeps the flight safer for everyone on board.

What About Power Banks And Devices

Power banks and portable chargers are treated as spare lithium batteries, not as devices. That means they must go in your carry-on — never in checked luggage. Even if the power bank is small enough to fit in your palm, it follows the same rules as any loose battery. The TSA’s spare batteries in carry-on page confirms this.

For devices that contain lithium batteries — laptops, tablets, cameras, phones, e-readers, handheld games — the rules are more flexible. You can pack them in either carry-on or checked baggage. Many travelers prefer carry-on anyway to keep valuables close and avoid damage from rough baggage handling.

Vape pens and e-cigarettes follow a stricter rule: the device and its batteries must be in carry-on only. They are completely prohibited in checked luggage. The same goes for spare batteries for these devices. If you travel with a drone or power tools that use lithium batteries, check both the battery size limits and your airline’s specific policy, as some airlines have their own restrictions.

The Bottom Line

You can bring lithium batteries on a plane, but the key rules are: spare batteries go in carry-on only, terminals must be protected from short circuits, and batteries over 100 Wh or 2 grams of lithium need airline approval. Most consumer electronics fall within the standard limits, so a quick check of the watt-hour label is usually all you need.

For your specific flight, check your airline’s website for any additional restrictions — some carriers have their own limits on the number of spare batteries or devices you can bring per passenger. TSA’s Spare Batteries in Carry-on page is a reliable starting point, and your airline’s customer service team can confirm their policy before you pack.