Can You Carry Lithium Batteries In Checked Luggage?

You’ve got a bag packed for a long weekend. Laptop, phone charger, maybe a spare battery pack for the camera. You pause at the door: can the whole bag go in the hold, or does something need to come out? It’s a common travel moment — and getting it wrong can stall your trip before it starts.

When the question is can you carry lithium batteries in checked luggage, the answer mostly breaks down to a single detail: is the battery installed in a device or not? The FAA and TSA draw a firm line on this. Here’s exactly how the rule applies to what you’re packing.

The Core Rule: Spare Batteries Are Banned in Checked Bags

Spare lithium batteries — power banks, loose camera batteries, external chargers — are strictly prohibited in checked luggage. This applies to both lithium ion and lithium metal types.

The logic is consistent across every major U.S. airline. Delta, American, and United all follow the federal hazardous materials regulations set by the FAA. A spare battery is defined as any battery not currently installed in a device.

If you can remove it from the gadget, it counts as spare. That distinction is the single most important rule to remember when you pack.

Why the Rule Is So Strict

The inconvenience of losing carry-on space to a battery pack is real. But the restriction is directly tied to inflight safety. Here is why lithium batteries are treated so carefully.

• Thermal Runaway Risk: A damaged or shorted lithium battery can overheat quickly and catch fire. In the cargo hold, a fire can grow undetected for a dangerous period of time.
• Crew Can’t Reach the Hold: Flight attendants are trained to handle cabin fires. A fire in the cargo hold is far harder to fight until the plane is on the ground.
• History of Incidents: The FAA has documented numerous incidents involving lithium batteries in baggage, which has driven tighter regulations over the last decade.
• FAA Safety Alerts: In 2025, the FAA issued a Safety Alert for Operators (SAFO 25002) specifically warning about the hazard of lithium batteries stowed in areas not visible or accessible to the flight crew.

So yes, that spare power bank takes up a bit of carry-on space. It’s a worthwhile trade-off for a safer flight.

The Fine Print on Installed Batteries

Here is where the rule gets less strict. A laptop with its built-in battery or a phone with an internal battery is treated differently from a loose cell.

Lithium batteries installed in a device are allowed in both checked and carry-on luggage. However, the FAA and TSA strongly recommend the cabin. Per the official FAA guidance covering spare lithium batteries prohibited in checked bags, installed devices are simply not considered spare batteries.

This catches travelers who assume any lithium battery must be a carry-on item. For installed batteries, the choice is yours, but the cabin remains the safer bet for protecting the device and managing any potential risk.

How to Pack Lithium Batteries for Carry-On

Packing batteries correctly for carry-on avoids delays at security and keeps your gear safe. Follow these best-practice steps.

1. Protect the Terminals: Place tape over the battery contacts or store each battery in its original case or a plastic sleeve. This prevents short circuits from keys or coins in your bag.
2. Respect Quantity Limits: You can generally carry up to 20 spare batteries under 100 watt-hours each for personal use. Larger batteries typically require airline approval.
3. Keep Large Devices Accessible: You may need to remove laptops and tablets from your bag at the security X-ray checkpoint. Pack them where you can grab them quickly.
4. Inspect for Damage: Look for swelling, cracks, or leaks before you travel. Damaged batteries are prohibited entirely.
5. Confirm with Your Airline: FAA rules set the baseline, but your specific airline may publish stricter or more specific guidance.

Taking these steps keeps the screening process smooth from the curb to the gate.

What Happens If You Pack Them Wrong

Accidentally leaving a spare battery in a checked bag happens more often than airlines like. Baggage screeners are trained to spot them during processing.

If a prohibited battery is found, your bag may be removed from the aircraft and held. You might be paged at the gate to return and remove the item, or in some cases the item is confiscated. For serious violations, a fine is possible. The TSA maintains clear guidance on this, and checking their carry-on baggage recommended page before you pack is a quick way to avoid the hassle.

The simplest approach: double-check your checked bag for any loose batteries before you leave home or head to the airport.

The Bottom Line

Spare lithium batteries must go in your carry-on. Installed devices can go either way, but the cabin is strongly recommended. Knowing the difference between a spare battery and an installed device is the single most important detail for a hassle-free trip.

If you still have doubts about a specific gadget or power bank, check your airline’s policy or search for it on your destination country’s civil aviation authority website (like the FAA for U.S. flights) before zipping up your bag.