What happens if you forget a lithium battery in checked luggage?
Forgetting a lithium battery in checked luggage violates international aviation safety regulations, as lithium batteries pose fire risks in cargo holds. If detected during screening, the luggage may be delayed, opened for inspection, or the battery confiscated. Severe cases could lead to fines or denied boarding. Spare lithium batteries must always be carried in hand luggage with terminals protected (e.g., taped or in original packaging) and under 100Wh capacity per battery.
Understanding the Difference Between UN3480 and UN3481 for Lithium Batteries
Why are lithium batteries banned in checked luggage?
Lithium batteries in checked bags risk thermal runaway due to pressure/temperature changes in cargo holds. Unlike cabin crew who can respond to fires, cargo compartments lack fire suppression systems, making even small battery failures catastrophic. Pro Tip: Use LiFePO4 batteries where possible—they’re less prone to thermal issues than Li-ion.
Regulations classify lithium batteries as Class 9 hazardous materials. The FAA prohibits spare batteries in checked luggage due to uncontrolled fire risks. For example, a punctured 18650 cell could ignite nearby luggage, potentially downing an aircraft. Always check your bags twice—TSA scanners can detect batteries as small as 2cm³. Transitioning to safer alternatives, some airlines now require battery fireproof pouches for carry-ons.
What’s the maximum lithium battery capacity allowed on planes?
Passengers can carry two spare batteries under 100Wh without approval. Batteries between 100–160Wh require airline authorization (e.g., medical equipment). Anything over 160Wh is banned on passenger flights. Pro Tip: Check your laptop’s battery label—a 11.1V 7800mAh pack equals 86.6Wh (11.1×7.8), which is compliant.
Devices with built-in batteries (like phones) can be checked if powered off, but spare batteries must stay in carry-ons. Capacity limits exist because higher energy density increases fire severity. For instance, a 200Wh battery contains enough energy to sustain a 2000°C flame for 30 minutes. Transitional protocols require airports to X-ray all bags—expect delays if your luggage flags a hidden power bank.
| Battery Type | Carry-On | Checked |
|---|---|---|
| Spare ≤100Wh | Allowed (2 max) | Banned |
| Built-in ≤160Wh | Allowed | Allowed if powered off |
Battery Expert Insight
FAQs
Yes, authorities typically discharge and recycle prohibited batteries. Repeated violations may result in travel bans or fines up to $2,000 under IATA DGR 10.3.
Can power banks go in checked luggage?
No. All external power banks must be carried onboard, regardless of capacity. Even a 5000mAh (18.5Wh) power bank triggers alerts if in checked bags.