Can I bring a power bank on a plane?

Yes, but the rules vary, so you should check the airline’s restrictions before your flight.

Generally, according to CASA, laptops and cameras may be included in checked luggage as long as they are completely powered off.

However, spare batteries and power banks must be carried in carry-on baggage due to risks of short-circuiting, overheating, and fires during flight.

Lithium-ion batteries exceeding 160WH are not allowed under any circumstances unless they are used as medical aids.

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Smart bags containing power banks or lithium-ion batteries are allowed, provided the battery can be removed and carried in the cabin before checking in.

Virgin Australia states that spare or loose batteries, including power banks, must solely be part of carry-on baggage and need to be kept in their original retail packaging; individual batteries should be placed in separate plastic bags, protective pouches, or have their terminals covered with tape.

Qantas advises that passengers with Apple AirPod cases and power banks containing spare or loose batteries should only store them in carry-on baggage.

The airline does not advise using or charging power banks on board for safety reasons.

Can I take a power bank on an overseas flight?

Numerous international airlines, including Thai Airways, Korean Airlines, Eva Airlines, Cathay Pacific, China Airlines, and Singapore Airlines and its budget arm Scoot, have imposed bans regarding their use on board.

If you plan to fly with an international airline, it is essential to verify their specific rules prior to traveling.

Generally, travelers are expected to keep power banks in their carry-on luggage. However, whether or not you can use them in-flight depends on the particular airline.

Is the risk of lithium battery fires significant on airplanes?

Not necessarily. Professor Neeraj Sharma, a battery specialist at the University of New South Wales, states that lithium-ion batteries contain 20 different components, some of which are liquid, making them more volatile than solid elements like electrodes and casings.

Applying pressure to a lithium-ion battery can spark “thermal runaway” (an uncontrollable temperature increase); however, battery explosions are exceedingly rare.

Sharma notes that airlines still recommend carrying batteries in baggage to minimize the risk.

He also mentions that power banks and other lithium-ion battery devices, which are less regulated than mobile phones and laptops (like electric scooters and steam devices), could pose more risks and may be made from inferior quality batteries.

Professor Amanda Ellis, head of the Department of Chemistry and Biomedical Engineering at the University of Melbourne, agrees that lithium battery fires are not particularly likely to happen on flights.

She explains that the pressure within an airplane cabin is supported by “multiple layers of casings,” preventing batteries from reaching a critical failure. However, enclosed environments can make fires particularly hazardous, especially since it’s not possible to escape the situation while in flight.

“Fires release highly toxic gases, especially in limited spaces that are far from ideal,” she remarks.

Ellis adds that lithium-ion battery fires can be challenging to extinguish, as lithium can ignite and ignite surrounding materials—high-energy substances that can sustain burning for extended periods.

“Using water to douse a lithium fire is not advisable, which could be the first instinct of someone on a plane,” she notes.

What causes lithium-ion batteries to ignite?

Lithium-ion batteries comprise ions suspended within an electrolyte solution. During charging and discharging, these ions travel back and forth across the two electrodes.

Ellis states that a common cause of battery fires is overcharging, which can lead to overheating. If a battery becomes excessively charged, it can crack, causing the highly flammable electrolyte to ignite when it contacts air.

More sophisticated lithium-battery-powered devices, like smartphones, typically include a built-in “trickle system” that prevents overcharging by incrementally adding current to the battery.

However, Ellis explains that cheaper power banks often lack this safety feature.

“Avoid charging a power bank overnight,” she advises. “Only charge it for as long as necessary. Monitor the power bank until the indicator light switches from red to green.”

Overall, Ellis reassures that if lithium batteries are used correctly and under suitable conditions, they are generally safe, and passengers need not be overly concerned while flying.