Are Battery Backup Allowed On Planes? | Stay Charged Safely

Battery backups, specifically lithium-ion power banks, are permitted on planes, but only in your carry-on luggage, never in checked bags.

Staying connected and powered up while traveling is a top priority for many. Whether it’s for your phone, tablet, or noise-canceling headphones, a reliable battery backup ensures your devices are ready when you need them. Understanding the rules for bringing these power sources on an airplane is essential for a smooth and stress-free journey.

The Essential Rule: Carry-On Only for Lithium-Ion Power Banks

The most important regulation to remember for battery backups, especially those containing lithium-ion cells, is their placement. These devices are strictly prohibited in checked luggage. They must always travel with you in your carry-on bag.

This rule exists due to the potential fire risk associated with lithium-ion batteries. In the rare event of a battery short-circuiting or overheating, an incident in the cargo hold would be much harder to detect and extinguish than one in the passenger cabin. According to the TSA, portable electronic devices powered by lithium-ion batteries and spare lithium-ion batteries must be carried in carry-on baggage.

This regulation applies universally across all airlines operating in and out of the United States, aligning with international aviation safety standards set by the International Civil Aviation Organization (ICAO).

Understanding Watt-Hours (Wh) and Milliamp-Hours (mAh)

When you look at your power bank, you’ll notice ratings in either milliamp-hours (mAh) or watt-hours (Wh). Aviation regulations primarily use watt-hours to determine permissible battery sizes for air travel. Knowing how to interpret these numbers is key to compliance.

Calculating Your Device’s Watt-Hours

If your battery backup only lists mAh, you can convert it to Wh using a simple formula: (mAh Voltage) / 1000 = Wh. Most power banks operate at a standard voltage of 3.7V. For example, a 20,000 mAh power bank would be (20,000 mAh 3.7V) / 1000 = 74 Wh.

The voltage is usually printed on the battery itself, often near the mAh rating. Always use the specific voltage listed on your device for an accurate calculation.

Permitted Watt-Hour Limits for Air Travel

There are specific Wh limits that dictate how many and what size battery backups you can bring. These limits are designed to balance convenience with safety.

• Up to 100 Wh: Most common power banks, including those around 20,000 to 27,000 mAh, fall into this category. You can bring an unlimited number of these batteries in your carry-on. No airline approval is needed.
• 101 Wh to 160 Wh: Larger power banks, often used for laptops or extended charging needs, fit here. You are limited to two spare batteries of this size per passenger. These batteries require airline approval, so it’s wise to contact your specific airline before travel to confirm their policy.
• Over 160 Wh: Batteries exceeding 160 Wh are generally prohibited from air travel, both in carry-on and checked luggage. These are typically very large power sources, not standard portable battery backups.

It is always a good practice to check with your specific airline before flying, especially if your power bank is close to the 100 Wh or 160 Wh thresholds, as individual airline policies can sometimes be stricter than general regulations.

Common Battery Backup Wh Limits for Air Travel

Watt-Hour (Wh) Range	Quantity Allowed (Carry-On)	Airline Approval Needed
Up to 100 Wh	Unlimited	No
101 Wh – 160 Wh	Two (2) per passenger	Yes
Over 160 Wh	Prohibited	N/A

Protecting Your Power Banks During Travel

Beyond simply placing them in your carry-on, taking steps to protect your battery backups helps ensure safety and device longevity. Preventing short circuits is the primary goal.

1. Individual Protection: Keep spare batteries in their original retail packaging if possible. If not, place each battery in a separate plastic bag, protective pouch, or use electrical tape to cover the terminals. This prevents accidental contact with other metal objects, such as keys or coins, which could cause a short circuit.
2. Avoid Loose Placement: Do not just toss loose batteries into your bag. They should be secured to prevent movement and potential damage.
3. Temperature Control: Avoid exposing your power banks to extreme temperatures, either hot or cold. Do not leave them in direct sunlight or in a freezing car, as this can degrade battery performance and safety.
4. Physical Damage: Treat your power bank with care. Dents, punctures, or swelling indicate damage and such batteries should not be taken on a plane.

Devices with Non-Removable Lithium Batteries

Many common electronic devices like laptops, tablets, e-readers, and cell phones contain built-in, non-removable lithium-ion batteries. These devices are generally allowed in both carry-on and checked luggage, with some considerations.

When these devices are in checked luggage, they should be completely powered off, not just in sleep mode. Taking extra precautions to protect them from accidental activation and damage is also recommended. However, for maximum safety and to keep your valuables close, it is always a good idea to pack these devices in your carry-on bag.

Battery Type and Recommended Travel Location

Battery Type/Device	Allowed in Carry-On	Allowed in Checked Bag
Lithium-ion Power Banks (Spare)	Yes (with Wh limits)	No
Devices with Installed Lithium-ion Batteries (e.g., Laptops, Phones)	Yes	Yes (must be powered off, protected)
Alkaline Batteries (e.g., AA, AAA)	Yes	Yes
NiMH/NiCd Batteries	Yes	Yes

International Travel Considerations

While the focus here is on US-based travel and regulations, the guidelines for battery backups are largely consistent globally. Most countries and airlines follow the ICAO guidelines, which form the basis for TSA and FAA rules.

This means the “carry-on only” rule for spare lithium-ion batteries and the watt-hour limits are widely adopted. If you are traveling internationally, a quick check of your specific airline’s website for their battery policy is always a sensible step, particularly when flying with a non-US carrier or departing from a foreign airport.