Southwest Airlines maintains specific rules for carrying lithium-ion batteries and devices to reduce fire risk and ensure safe operations. This overview explains what passengers can bring on board, how to pack spare batteries, and what applies to checked bags. In general, portable electronic devices with built-in or removable lithium-ion batteries are allowed, while rules vary by size, watt-hour rating, and whether the battery is installed or spare. The following sections define key terms, outline limits, and provide practical steps to comply with Southwest policies and federal aviation requirements.
What counts as a lithium-ion battery on Southwest
Lithium-ion batteries appear in smartphones, laptops, tablets, cameras, power banks, and other portable electronics. Southwest treats devices with lithium-ion or lithium metal batteries as regulated materials that must meet capacity, packaging, and carriage rules. Understanding whether your item uses lithium-ion chemistry and how the battery is installed helps determine which rules apply.
Key definitions and examples
- Lithium-ion battery: A rechargeable battery using lithium ions, common in consumer electronics.
- Installed battery: A battery built into a device that cannot be removed without tools.
- Spare battery: A removable battery not installed in a device, carried separately.
- Personal Electronic Device (PED): Consumer electronics such as laptops, tablets, and phones.
Lithium battery rules for carry-on bags
In carry-on luggage, Southwest allows most common lithium-ion devices and spare batteries within established limits. This keeps items accessible for screening and reduces hazards in cargo areas. Always keep devices and batteries in carry-on bags unless specific rules require otherwise. Be prepared for additional screening and follow crew instructions if a device becomes hot or smokes.
Power and capacity limits
Southwest aligns with TSA and FAA regulations on lithium content and watt-hour ratings. These limits help prevent thermal runaway and fire risk. Passengers may carry multiple small devices and batteries if each meets the thresholds below and they are properly protected.
| Item or Attribute | Verified Detail or Limit | Source Type |
|---|---|---|
| Lithium metal battery (lithium content) | Up to 2 grams per battery | TSA/FAA regulation |
| Lithium-ion battery (watt-hour rating) | Up to 100 Wh per battery | TSA/FAA regulation |
| Spare lithium-ion batteries (100–300 Wh) | Up to two batteries, must be approved and protected | TSA/FAA regulation |
| Lithium-ion battery exceeding 300 Wh | Not allowed in carry-on or checked bags on passenger aircraft | TSA/FAA regulation |
| Portable electronic device with installed battery | Allowed in carry-on; no separate watt-hour limit if device is FAA-compliant | Southwest policy + TSA |
Packing and preparation guidance
Proper packing reduces the chance of short circuits, accidental activation, and damage. Keep batteries and devices insulated, separated, and easily accessible for screening. Do not pack loose batteries in checked bags, and avoid exposing them to heat or pressure. Review these steps before you arrive at the gate.
Best practices for passengers
- Carry loose batteries in original retail packaging or in a dedicated battery case.
- Tape exposed terminals or place each battery in a separate protective pouch.
- Keep devices and batteries in carry-on bags whenever possible.
- Do not charge batteries or devices during boarding or flight unless permitted.
- Notify airline staff immediately if a device or battery becomes hot, smokes, or sparks.
Checked bags and lithium batteries
Southwest generally discourages or restricts lithium-ion batteries in checked bags because of fire risks in areas that are not monitored in-flight. Most common consumer devices with installed batteries are allowed in checked bags only if they are fully protected and the battery cannot move into an operating position. Knowing when a checked bag is acceptable helps avoid last‑minute repacking at the curb.
When checked bags are permitted
- Devices with installed lithium-ion batteries may be checked if the battery is firmly secured and protected from damage.
- Spare lithium-ion batteries are not allowed in checked bags.
- Lithium metal batteries are generally not permitted in checked bags unless specifically authorized.
- Always declare batteries at check-in if required, and consider keeping them in carry-on instead.
Travel-ready checklist
Use this quick list to confirm your items meet Southwest expectations before you leave for the airport. These actions help speed screening and reduce the risk of delays or denied boarding.
- Verify watt-hour or lithium content ratings on each battery.
- Pack spare batteries in protective cases and keep them in carry-on.
- Insulate terminals with tape or place each battery in a separate pouch.
- Keep devices accessible in a dedicated bin for screening.
- Do not place loose batteries in checked luggage.
What to do if a device or battery is damaged
If a device swells, becomes hot, leaks, or smokes during your trip, react calmly and promptly. Notify a Southwest crew member immediately and follow their instructions. Do not attempt to extinguish a lithium battery fire with water alone, and be prepared for possible diversion or emergency response procedures if the situation escalates.
Staying updated with Southwest policy
Battery rules can change as new regulations or guidance emerge. The best way to remain current is to check Southwest’s official website for their latest baggage and prohibited items policy, review TSA’s transportation security rules, and reconfirm closer to your travel date if you carry multiple batteries or high-capacity devices.
By following these guidelines, you can travel confidently while reducing risk and ensuring a smoother experience at the gate and on board.