Yes, battery power packs are allowed on planes, but only in your carry-on luggage, never in checked bags, due to fire safety regulations.
Keeping our devices charged while traveling is a constant consideration, especially with long layovers or unexpected delays. Understanding the specific rules for bringing battery power packs on an airplane helps ensure a smooth journey and avoids any surprises at security checkpoints.
The Core Rule: Carry-On Only
The fundamental rule for traveling with battery power packs, also known as portable chargers or external batteries, is straightforward: they belong in your carry-on bag. This regulation applies universally to all lithium-ion batteries, including those found in laptops, tablets, and mobile phones, when they are not installed within the device itself.
The primary reason for this strict policy is fire safety. Lithium-ion batteries, while generally safe, carry a small risk of overheating and igniting, a phenomenon known as thermal runaway. Should this occur in the passenger cabin, flight attendants can quickly identify and address the situation. In the cargo hold, a fire could go undetected for an extended period, posing a severe threat to the aircraft and everyone on board.
Understanding Power Pack Capacities: Wh vs. mAh
To comply with airline regulations, travelers must understand their power pack’s capacity, typically measured in Watt-hours (Wh) or milliamp-hours (mAh). These units indicate how much energy the battery can store.
Calculating Watt-Hours
Most airline rules are based on Watt-hours (Wh). If your power pack only lists milliamp-hours (mAh), you can calculate the Watt-hours using a simple formula: (mAh V) / 1000 = Wh. The voltage (V) for most USB power banks is 3.7V. For example, a 20,000 mAh power bank at 3.7V would be (20,000 3.7) / 1000 = 74 Wh.
Common Capacity Ranges
- Under 100 Wh: Most common power banks fall into this category and are generally permitted in carry-on baggage.
- 100 Wh to 160 Wh: These larger capacity power banks require airline approval. Travelers must contact their airline beforehand to confirm allowance.
- Over 160 Wh: Power packs exceeding 160 Wh are typically forbidden from both carry-on and checked baggage on commercial passenger flights.
Specific Capacity Limits for Air Travel
Airlines and aviation authorities implement specific limits on the Watt-hour rating of lithium-ion batteries. These limits are in place to manage the potential energy density and associated risks of these power sources during flight.
For instance, according to the TSA, lithium-ion batteries and portable power banks must be stored in carry-on bags and are strictly prohibited in checked luggage. This rule applies to spare batteries as well, not just those integrated into devices.
The Federal Aviation Administration (FAA) outlines clear guidelines regarding lithium battery transport. Passengers are generally allowed to carry-on portable chargers with a capacity of up to 100 Wh without special approval. Power banks between 101 Wh and 160 Wh require airline permission, and usually, a limit of two such batteries per passenger applies. Any battery exceeding 160 Wh is not allowed on passenger aircraft.
| Capacity (Wh) | Approx. mAh (at 3.7V) | Carry-On Status |
|---|---|---|
| Under 100 Wh | Under 27,000 mAh | Permitted |
| 100-160 Wh | 27,000 – 43,000 mAh | Airline Approval Needed (Max 2) |
| Over 160 Wh | Over 43,000 mAh | Forbidden |
Preparing Your Power Pack for Security and Flight
Proper preparation of your power pack ensures a smooth experience at security checkpoints and during your flight. A few simple steps can prevent delays or issues.
- Protect Terminals: Prevent short circuits by keeping power packs in their original retail packaging, a battery case, a protective pouch, or by taping over exposed terminals.
- Turn Off: Ensure the power pack is turned off before placing it in your carry-on. This prevents accidental activation.
- Accessibility: While not always required, having your power pack easily accessible can speed up security screening if agents need to inspect it.
- Avoid Damage: Pack your power pack securely within your carry-on to prevent physical damage during transit, which could compromise its safety.
International Travel: Beyond US Borders
While the guidelines provided by the FAA and TSA are a strong foundation, international travel introduces variations. Aviation authorities worldwide, including the International Civil Aviation Organization (ICAO), often align with similar safety standards for lithium batteries.
However, specific country regulations or individual airline policies can differ slightly. Before flying internationally, it is always a good practice to check the specific airline’s website and the destination country’s aviation authority guidelines. This proactive step helps avoid any discrepancies or unexpected prohibitions upon arrival or departure.
Other Battery Types and Their Rules
The rules for batteries extend beyond just lithium-ion power packs. Different battery chemistries have varying regulations due to their distinct safety profiles.
- Alkaline Batteries (AA, AAA, C, D, 9V): These common household batteries are generally permitted in both carry-on and checked luggage. It is advisable to protect their terminals to prevent short circuits.
- Nickel-Metal Hydride (NiMH) and Nickel Cadmium (NiCd) Batteries: Similar to alkaline batteries, these are typically allowed in both carry-on and checked bags. Terminal protection is still recommended.
- Spare Lithium-Ion Batteries (for devices): Any spare lithium-ion batteries not installed in a device, such as extra camera batteries or laptop batteries, must be carried in your carry-on luggage. They are not allowed in checked bags.
| Battery Type | Carry-On Baggage | Checked Baggage |
|---|---|---|
| Lithium-ion Power Packs (under 100 Wh) | Permitted | Forbidden |
| Lithium-ion Power Packs (100-160 Wh) | Airline Approval Needed (Max 2) | Forbidden |
| Lithium-ion Power Packs (over 160 Wh) | Forbidden | Forbidden |
| Alkaline Batteries (AA, AAA, etc.) | Permitted | Permitted |
| NiMH/NiCd Batteries | Permitted | Permitted |
| Spare Lithium-ion Batteries (not in device) | Permitted | Forbidden |
Why These Rules Matter: Aviation Safety
The stringent regulations surrounding lithium batteries on aircraft are a direct response to documented safety incidents. While rare, thermal runaway events in lithium batteries can lead to intense fires that are difficult to extinguish, especially in the confined space of an aircraft cabin or cargo hold.
A battery fire in the cargo hold presents a particularly dangerous scenario because it may not be detected by smoke detectors designed for general cargo fires. The intense heat and gases produced by a lithium battery fire can overcome standard fire suppression systems. By requiring power packs in carry-on luggage, flight crews can respond immediately to any signs of overheating, using specialized fire containment bags or water to cool the battery and prevent further escalation.