Can You Bring Lithium Batteries In Carry-On? | TSA Guide

Most travelers assume lithium batteries are banned from flights outright — that they spark confiscation at every checkpoint. The reality is the opposite. TSA and FAA rules explicitly require lithium batteries to travel with you in the cabin, not in the cargo hold.

This guide covers exactly what types of lithium batteries are allowed, how many you can bring, and how to pack them safely so you can breeze through security without a hiccup.

Which Lithium Batteries Are Allowed in Carry-On?

Nearly all consumer electronics with installed lithium batteries — laptops, phones, tablets, cameras, and handheld gaming devices — are fine in carry-on baggage. The key limit is on spare (uninstalled) batteries and battery size.

Standard lithium ion rechargeable batteries must stay under 100 watt hours (Wh) per battery to fly without special approval. That covers every mainstream laptop and phone battery on the market. Lithium metal (non-rechargeable) batteries are limited to 2 grams of lithium per battery.

For larger rechargeable batteries in the 101–160 Wh range — often used in pro video gear or extended-life laptop batteries — you may bring up to two per passenger, but only after getting airline approval at the gate or in advance. Batteries over 160 Wh are prohibited on passenger aircraft entirely.

Why the Rules Favor Carry-On Over Checked

The reasoning is pure safety. Lithium batteries can overheat, catch fire, or even explode under certain conditions. In a pressurized cargo hold, there’s no way for crew to spot or fight a fire. In the cabin, flight attendants can respond immediately.

• Fire risk in cargo hold: A lithium battery fire in the cargo hold is harder to detect and extinguish. The FAA requires all spare batteries to stay accessible in the cabin.
• Damaged and recalled batteries banned entirely: If a battery is cracked, swollen, dented, or under a recall notice, do not pack it in any luggage. These are prohibited from air travel period.
• Portable chargers and power banks count as spare batteries: Any battery pack not installed inside a device must go in carry-on. That includes phone charging cases and external power banks.
• Checked luggage ban for spare batteries: Lithium batteries, power banks, e-cigarettes, and lighters are explicitly forbidden from checked baggage on all U.S. airlines.
• Airline approval required for larger batteries: Batteries between 101 and 160 Wh need airline permission. Pack them in a protective case and have the airline’s hazard approval ready at check-in.

These rules apply to all carriers operating in the U.S., including United, American, Delta, and Southwest, per the FAA’s unified hazmat regulations.

How Many Lithium Batteries Can You Bring in Carry-On?

The number depends entirely on battery size. For small consumer batteries under 100 Wh — typical phone, tablet, and laptop packs — there is no quantity limit as long as they are for personal use. The restriction only kicks in for larger batteries.

A single passenger may bring up to two spare batteries in the 101–160 Wh range, but only with airline approval. For mobility devices, the FAA allows one spare battery up to 300 Wh or two spares up to 160 Wh each. View the full carry-on baggage rule for a complete list.

Remember: these limits apply to spare batteries only. Batteries installed inside a device follow a different, more permissive set of rules.

Tips for Packing Lithium Batteries Safely

Packing lithium batteries correctly prevents shorts, overheating, and the hassle of a TSA bag search. Follow these steps to stay compliant:

1. Protect the terminals: Tape over the battery contacts or place each spare battery in its original packaging, a plastic battery case, or a separate plastic bag. Loose batteries touching keys or coins can short-circuit.
2. Remove batteries if possible: If a device lets you remove the battery easily, take it out and carry it in your hand luggage. This lowers the chance of accidental activation during the flight.
3. Inspect for damage before you go: Check for swelling, cracks, dents, or any signs of damage. Recalled or defective batteries are banned from all flight — leave them at home.
4. Keep them in your personal item: Store lithium batteries in the bag you keep under the seat. This makes them accessible if a crew member needs to handle them.
5. Check airline policy for large batteries: If you plan to bring batteries over 100 Wh, call your airline ahead of time to confirm their approval process. Some carriers require written confirmation at check-in.

Most incidents involving lithium batteries on planes stem from damaged or improperly packed spare batteries. A few seconds of prep can make all the difference.

What About Power Banks, E-Cigarettes, and Mobility Devices?

Power banks and portable chargers are classified as spare lithium batteries. That means they must go in carry-on luggage only and cannot be packed in checked baggage. The same rule applies to e-cigarettes and vaping devices — they are not allowed in the cargo hold under any circumstances.

For mobility devices like wheelchairs and scooters, the FAA provides a dedicated exception. You may carry one spare battery up to 300 Wh or two spare batteries each up to 160 Wh for the device, but these must remain in the cabin. If the battery is non-removable, the device may require special handling. The FAA’s official accessible carry-on rule explains the details for passengers with mobility aids.

Camera and drone batteries typically fall under the standard 100 Wh limit. For example, underwater housing battery packs from Ikelite are rated at 28.86 Wh — well within the allowance. Always check the watt-hour rating printed on the battery before you travel.

The Bottom Line

Lithium batteries are welcome in carry-on, but they need to be packed thoughtfully. Stick to batteries under 100 Wh for unlimited personal use, get approval for larger ones, and keep all spares accessible in the cabin. Never pack damaged, recalled, or obviously defective batteries.

Because individual airlines may add their own restrictions on top of TSA and FAA rules, it is always wise to check your specific carrier’s policy before heading to the airport — especially for international flights where IATA guidelines may differ.