Can You Take a Flashlight on a Plane? TSA Rules for Flashlights and Spare Batteries
Yes, you can take a flashlight on a plane. TSA allows flashlights in both carry-on and checked bags, and its flashlight listing sets no size or brightness limit. What trips people up is the battery. The rules for lithium-ion batteries are stricter than the rules for the flashlight itself, and they decide where your light and your spares need to go.
This guide covers what TSA and the FAA actually say, how to work out whether a battery is under the limit, and how to pack a flashlight so it gets through security without a second look. We checked the TSA and FAA pages linked below in October 2026.
The Short Answer
- Flashlight in your carry-on: allowed.
- Flashlight in your checked bag: allowed. If it has a lithium-ion battery inside, the FAA asks that it be powered off and protected from accidental activation.
- Spare lithium-ion batteries (up to 100 Wh each): carry-on only, protected from short circuit.
- Larger spare batteries (101–160 Wh): carry-on only, with airline approval, and no more than two per person.
- Final say: the TSA officer at the checkpoint decides what goes through.
What TSA Says About Flashlights
TSA's What Can I Bring? listing for flashlights shows "Yes" for carry-on bags and "Yes" for checked bags. The listing does not break flashlights into categories, so a pocket light and a rechargeable duty light are covered by the same entry. As with every item TSA lists, the officer at the checkpoint has the final decision on the day.
The one thing to keep separate is a light that includes a stun or shock function. TSA lists stun guns and shocking devices as a different item, not allowed in carry-on bags. An ordinary flashlight, including a tactical one, is not in that category. If you want to avoid any conversation at the checkpoint with a tactical light, packing it in your checked bag is allowed, as long as you follow the battery steps below.
The Battery Rules Matter More Than the Flashlight
Almost every rechargeable flashlight runs on a lithium-ion battery, so the FAA's battery rules apply to nearly every light you might pack. They depend on whether the battery is installed in the light or loose as a spare.
| What you're packing | Carry-on | Checked bag |
|---|---|---|
| Flashlight with a lithium-ion battery installed (100 Wh or less) | Allowed | Allowed, powered off and protected from accidental activation |
| Spare lithium-ion battery, 100 Wh or less | Allowed, protected from short circuit | Not allowed |
| Spare lithium-ion battery, 101–160 Wh | Allowed with airline approval, two per person | Not allowed |
| Spare lithium-ion battery, over 160 Wh | Not allowed | Not allowed |
| Spare non-rechargeable lithium batteries (such as CR123A), 2 grams of lithium or less | Allowed | Not allowed |
These come from the FAA's PackSafe guidance on batteries and TSA's pages for lithium batteries in a device and batteries over 100 watt-hours. A spare is any battery that is not installed in a device, so a flashlight battery sitting in your bag counts as a spare, and so does a power bank.
How to Check Whether a Battery Is Under 100 Wh
Watt-hours are not printed on most flashlight batteries, but you can work them out from two numbers that are: voltage and capacity. Multiply volts by amp-hours (mAh divided by 1,000).
- A 5,000 mAh 21700 battery at 3.6 V works out to 18 Wh. That is the rating of the Fenix ARB-L21-5000U.
- A 3,400 mAh 18650 at a nominal 3.6 V comes to about 12 Wh, which is the class the Fenix ARB-L18-3400U V3 falls into.
Single flashlight cells are far below the 100 Wh line. The limit becomes relevant for large power banks and external battery packs, not for the batteries that power a handheld light or headlamp.
How to Pack a Flashlight for Air Travel
- Keep spare batteries in your carry-on. Loose lithium batteries are not allowed in checked bags, so carry every spare with you.
- Stop the terminals from touching metal. The FAA wants spares protected from short circuit. Use the original packaging, a plastic battery case, or a separate small pouch for each battery, and keep them away from keys and coins.
- Make sure the light cannot switch on. A flashlight that turns on inside a bag gets hot and can drain the battery. Use the light's lockout if it has one, or take the battery out. The Fenix E03R V2 has a lockout function for storage and transport. The manual for the Fenix PD35R ACE says to unscrew the tail a few turns or remove the battery before storage or transportation.
- Keep your light where you can reach it. If an officer wants a closer look, it is easier when the light is on top in your carry-on rather than at the bottom of a checked bag.
- Check the airline and the destination. The FAA and TSA rules cover flights in the United States. Other countries and individual airlines can be stricter, especially for large batteries and power banks.
Fenix Lights That Travel Well
Any of the lights below is allowed under the rules above. They are listed by how people tend to travel with them.
- Lightest option: the Fenix E03R V2 is a USB-C rechargeable keychain light with a built-in battery and a lockout function, so there is no loose battery to pack.
- Easy to power anywhere: the Fenix E12 V3 runs on a single AA battery that you can buy at your destination, so you do not have to carry a charger.
- Full-size carry: the Fenix PD35R ACE is a rechargeable light with a hidden USB-C port. It is also a good test of the packing advice above: remove the battery or loosen the tail before you fly.
- Spare batteries: if you need a backup, carry it in your hand luggage with the ARB-L18-3400U V3 (18650) or the ARB-L21-5000U (21700), kept in a case. Browse the full flashlight batteries collection to match a battery to your light.
Frequently Asked Questions
Can I bring a flashlight on a plane?
Yes. TSA lists flashlights as allowed in both carry-on and checked bags. The TSA officer at the checkpoint has the final decision.
Can I take a flashlight in a checked bag?
Yes. If the flashlight has a lithium-ion battery inside, the FAA asks that it be powered off and protected from accidental activation. Spare batteries do not go in checked bags.
Can I bring spare flashlight batteries on a plane?
Yes, in your carry-on only. Spare lithium-ion batteries must be 100 Wh or less per battery unless the airline approves a larger one, and each should be protected from short circuit.
Can I take a rechargeable flashlight with a built-in battery on a plane?
Yes. A light with a lithium-ion battery built in or installed is allowed in carry-on and checked bags. Keep it switched off or locked out so it cannot turn on in transit.
Can I bring a tactical flashlight on a plane?
TSA's flashlight listing does not treat tactical lights differently from other flashlights, and the officer at the checkpoint makes the final call. For more on how tactical lights are treated, see our guide on whether tactical flashlights are legal.
Is there a size or lumen limit for flashlights on planes?
TSA's flashlight listing does not state a size or lumen limit. Battery size is what matters: spare lithium-ion batteries over 100 Wh need airline approval.
For more on how to look after the batteries you travel with, read our lithium-ion battery safety guide. To match a battery to your light, see the Fenix batteries guide.
