Understanding Carry-On Restrictions for Lithium Batteries and Electronics in 2025

Every year, millions of travelers pass through airport security with smartphones, laptops, tablets, and power banks tucked into their carry-on bags. Yet many remain unaware of the specific rules governing lithium batteries and electronics in the cabin. These restrictions have evolved rapidly since the early 2000s, driven by incidents of battery fires and the aviation industry's commitment to preventing in-flight hazards. Knowing what you can bring, how to pack it, and why the rules exist is essential for a smooth security screening and a safe journey.

This guide covers the core regulations from the Transportation Security Administration (TSA), the Federal Aviation Administration (FAA), the International Civil Aviation Organization (ICAO), and the International Air Transport Association (IATA). We will also explore practical packing advice, airline-specific policies, and common passenger questions about power banks, e-cigarettes, and medical devices. By the end, you will have the knowledge to travel confidently with your electronics without risking confiscation or safety issues.

Why Do Lithium Batteries Face Special Restrictions?

Lithium-ion batteries power nearly every modern portable electronic device because of their high energy density and rechargeability. However, the same chemistry that makes them efficient also creates risks. If a lithium-ion battery is damaged, overcharged, exposed to extreme heat, or short-circuited, it can enter a state known as thermal runaway. In this reaction, the battery temperature skyrockets, releasing flammable electrolyte vapor and frequently igniting nearby materials. In the confined environment of an aircraft cabin, a small fire can escalate quickly, endangering passengers and crew.

Notable Incidents That Shaped the Rules

Several high-profile events spurred stricter regulations. In 2010, a cargo plane carrying a large shipment of lithium batteries crashed in Dubai, an incident later attributed to a battery fire. In 2013, the FAA banned bulk shipments of lithium-ion batteries on passenger aircraft after a series of near-misses in cargo holds. More recently, the FAA recorded over 400 air transport incidents involving lithium batteries between 2015 and 2023, with many occurring in the passenger cabin. These events, combined with recalls of products like the Samsung Galaxy Note7, cemented the need for strict carry-on-only policies and watt-hour limits.

Why Carry-On Luggage Is Preferred

Aviation authorities worldwide require lithium batteries to be brought in carry-on baggage rather than checked luggage. This rule exists because cabin crew can respond immediately if a battery begins to overheat or catch fire. In the cargo hold, a fire might go unnoticed until it is too late. The FAA and IATA also note that the cabin pressure and temperature are more controlled, reducing the likelihood of battery stress. Spare batteries (those not installed in a device) are especially vulnerable because their terminals can short-circuit against metal objects like keys or coins. That is why they must be carried in the cabin with protective covers.

General Carry-On Restrictions: The Core Rules

The following restrictions apply to the majority of airlines and are based on standards set by ICAO and the FAA. Individual airlines may impose slightly different limits, so always check your carrier's website before flying.

Devices with Installed Batteries

Most consumer electronics such as smartphones, laptops, tablets, e-readers, cameras, and handheld game consoles are allowed in carry-on luggage as long as the battery is securely installed. You can also bring small appliances like electric razors, toothbrushes, and hair clippers. The device must be fully turned off or in sleep mode during critical phases of flight (takeoff and landing) unless the airline permits use. Devices that appear damaged, swollen, or overheating may be refused boarding.

Spare (Uninstalled) Batteries

Spare lithium-ion and lithium-metal batteries must always go in carry-on luggage. They are strictly forbidden in checked baggage. The key requirements:

  • Protect the terminals: Place each spare battery in its original retail packaging, a separate plastic bag, or use insulating tape over the contacts. Do not let them come into contact with metal objects.
  • Limit quantity: You may carry up to 20 spare batteries with a rating of 100 watt-hours (Wh) or less for consumer devices. Many airlines also cap the total number of lithium batteries at 20 per passenger.
  • Higher capacity batteries (100–160 Wh): These require prior airline approval. They are typically limited to two per passenger. Common examples include large external power banks, professional camera batteries, and certain medical equipment batteries.
  • Above 160 Wh: Forbidden unless specifically approved by the airline as cargo and shipped under dangerous goods regulations. This applies to electric vehicle batteries, large ebike packs, and industrial power tools.

Watt-Hours Explained

Watt-hours (Wh) measure the energy capacity of a battery. To find the watt-hours of a battery, multiply the voltage (V) by the ampere-hours (Ah). For example, a typical smartphone battery is about 10–15 Wh, a laptop battery ranges from 40–80 Wh, and most power banks fall between 20–100 Wh. Batteries with unclear or missing Wh markings may be confiscated. Check the label on the battery or the device manual for this information. If you cannot determine the rating, pack the item in checked luggage only as spare batteries are not allowed without a visible rating.

How to Pack Lithium Batteries and Electronics Safely

Beyond the basic rules, proper packing reduces risk and speeds up security screening. Follow these detailed guidelines.

Protecting Battery Terminals

The first line of defense is preventing short circuits. For spare batteries:

  • Original packaging: The best option. Retail packaging is designed to insulate terminals.
  • Silicone or plastic caps: Use the caps that came with the battery or purchase terminal covers.
  • Insulating tape: A small strip of electrical tape over the positive and negative terminals works well.
  • Separate compartments: Place each battery in a separate small zippered case or plastic bag. Do not toss loose batteries into a pocket or bag section where they can rub against keys, coins, or other batteries.

Securing Devices

Devices with installed batteries are generally safe, but you should:

  • Turn the device off completely when not in use. If it has a removable battery, consider taking it out and placing it in a protective case.
  • Keep devices in a well-padded section of your bag to avoid pressure or impact damage.
  • Avoid packing devices near heavy items like books or metal water bottles that could press against the battery.
  • Do not bring any device that shows signs of swelling, bulging, cracking, or leaking. Such batteries are a serious fire hazard.

Power Banks and External Chargers

Power banks are among the most commonly misunderstood items. They are treated as spare batteries and must be carried in the cabin, never in checked luggage. The FAA allows power banks up to 100 Wh without approval. Many popular models are around 100 Wh (e.g., 27,000 mAh at 3.7V equals 99.9 Wh). If your power bank is over 100 Wh, you need airline permission. Most consumer power banks under 27,000 mAh are safe to fly. Note that power banks with integrated cables or wireless charging pads still count as batteries and must follow the same rules.

Damaged or Recalled Batteries

Under no circumstances should you travel with damaged, swollen, or recalled batteries. The FAA specifically advises passengers not to bring recalled battery models on aircraft. If you have a battery that you suspect is defective, contact the manufacturer for disposal or replacement before your trip. Security personnel may inspect your electronics and refuse to allow items that appear compromised.

Airline-Specific Variations in Carry-On Restrictions

While the FAA and TSA set a baseline, individual airlines can impose stricter limits. Below are examples from major US carriers.

Delta Air Lines

Delta follows the FAA standard but allows a maximum of 20 spare batteries with 100 Wh or less. Batteries between 100 and 160 Wh require advance approval and are limited to two per passenger. Delta also explicitly bans power banks with damaged or swollen cases. E-cigarettes and vaping devices are allowed only in carry-on, with the battery removed and protected. For more details, visit Delta's dangerous goods page.

American Airlines

American Airlines allows spare lithium batteries up to 100 Wh without approval. For batteries between 100 and 160 Wh, you must notify the airline at least 24 hours in advance. American specifically notes that batteries for hearing aids and other medical devices are allowed in either carry-on or checked baggage, but spare medical batteries should still be in the cabin. The airline also prohibits loose lithium batteries in checked luggage for any reason. Check American's restricted items list for updates.

United Airlines

United limits spare batteries to 100 Wh unless pre-approved. The airline also restricts spare batteries to no more than 20 units per passenger. United requires that all spare batteries be individually protected and states that batteries must be for personal use only. Commercial quantities (e.g., dozens of batteries) must be shipped as cargo. See United's restricted items policy.

Southwest Airlines

Southwest follows the same FAA standards but adds that all electronic devices must be turned off during takeoff and landing. Spare batteries must be in carry-on bags and protected. Southwest also prohibits power banks that are larger than 100 Wh without prior approval. For non-rechargeable lithium metal batteries (like those in watches and calculators), you can carry up to 2 grams of lithium content in spare batteries in the cabin.

Special Considerations for Electronics and Other Devices

Different types of electronics have unique rules beyond the basic battery restrictions.

Laptops and Tablets

Laptops and tablets are allowed in carry-on luggage, but they must be removed from your bag during TSA screening if the airport uses standard X-ray machines. At airports with newer computed tomography (CT) scanners, you may be able to leave devices in your bag. Check with your airline or the TSA for current screening procedures. As of 2025, the TSA still requires that laptops be placed in a separate bin at most US airports. Larger laptops with batteries over 100 Wh are rare but require airline approval.

E-Cigarettes and Vaping Devices

The FAA and all major airlines prohibit e-cigarettes, vape pens, and personal vaporizers in checked baggage. They are allowed in carry-on luggage but with a critical caveat: the battery must be removed and placed in a protective case if the device is designed to be disassembled. If the battery is integrated (like many pod-based vapes), the entire device must be in the cabin. You are not permitted to charge vaping devices on board or use them while flying. Spare e-liquid bottles are subject to the TSA's liquids rule (3.4 oz or less in a clear quart-sized bag).

Medical Devices and Assistive Equipment

Medical devices containing lithium batteries, such as portable oxygen concentrators (POCs), CPAP machines, insulin pumps, and hearing aids, are generally allowed in both carry-on and checked baggage, though airlines prefer them in the cabin. Always notify the airline if you are traveling with a medical device that contains a lithium battery. You may need to provide documentation from your physician. Spare batteries for medical devices are allowed in carry-on without counting toward the typical consumer battery limit, but they should still be protected. The FAA provides a helpful Pack Safe guide for medical batteries.

Portable Speakers and Drones

Portable Bluetooth speakers often contain non-removable lithium batteries. These are fine in carry-on as long as the speaker does not exceed 100 Wh (most are far below that). Drones are trickier: they often have spare batteries (multiple high-capacity packs). Each battery must be under 100 Wh or have airline approval, and you must carry all drone batteries in your carry-on. Drones themselves can also be in checked luggage, but any spare batteries must stay in the cabin. Some airlines impose a strict limit of two drone batteries per passenger, so check ahead.

International Travel: Rules Beyond the United States

The rules described so far align with US regulations, but international travelers must be aware of additional differences.

European Union (EASA)

The European Union Aviation Safety Agency (EASA) follows similar principles: spare lithium batteries are prohibited in checked luggage and must be in carry-on with protected terminals. However, EASA allows a maximum of 20 spare batteries with up to 100 Wh for personal use. For batteries between 100 and 160 Wh, two are allowed with airline approval. Some European carriers, like Ryanair and EasyJet, may have stricter enforcement, so always check.

Asia-Pacific (CASA, CAAC)

Australia's Civil Aviation Safety Authority (CASA) largely mirrors IATA standards. China's Civil Aviation Administration (CAAC) is particularly strict: power banks must be carried in the cabin and are banned from checked baggage. Chinese airlines often require power banks under 100 Wh and limit passengers to two. Hong Kong and Singapore also follow IATA rules but may ask for proof of battery rating at check-in.

Middle East and Africa

Emirates, Qatar Airways, and Etihad all adhere to IATA guidelines. Passengers traveling through Dubai or Doha should be aware that security may confiscate any battery without a clear watt-hour label. In some African countries, rules are less standardized, but the major carriers (Ethiopian Airlines, Kenya Airways) follow IATA recommendations. When in doubt, contact the airline directly before departure.

Practical Tips for a Hassle-Free Security Screening

To minimize delays and avoid having items flagged:

  • Organize your electronics: Keep all devices and spare batteries in an easily accessible part of your carry-on. During screening, you may need to remove laptops, tablets, and large power banks.
  • Label your batteries: If you have a power bank or other battery with faded labeling, use a permanent marker to write the watt-hour rating on the battery.
  • Declare unusual items: If you are carrying a battery-powered tool, medical equipment, or a high-capacity battery, tell the TSA officer before the screening begins.
  • Know the limits: Pack only what you need for the flight. Do not bring extensive collections of spare batteries unless required for your work.
  • Check government resources: The FAA Pack Safe website provides a comprehensive list of which items are allowed in checked and carry-on luggage. The TSA "What Can I Bring?" tool is also invaluable for real-time searching.

Conclusion

Carry-on restrictions for lithium batteries and electronics exist to safeguard everyone on board. By understanding the reasoning behind the rules, the specific watt-hour limits, the packing requirements for spare batteries, and the unique policies of your airline, you can travel with confidence and avoid security headaches. The key takeaways are simple: keep all spare batteries in your carry-on with terminals protected, respect the 100 Wh threshold unless you have prior approval, never bring damaged or recalled batteries, and verify your airline's specific rules before you pack.

As battery technology evolves, regulations may shift. For example, new solid-state batteries and ultra-high-capacity power banks are already prompting regulators to update guidelines. Stay informed by checking official sources like the FAA, ICAO, and your airline before each trip. Safe travels, and may your devices stay charged and your flights free of drama.