What size battery is not allowed on a plane?

Lithium metal (non-rechargeable) batteries are limited to 2 grams of lithium per battery. Lithium ion (rechargeable) batteries are limited to a rating of 100 watt hours (Wh) per battery. These limits allow for nearly all types of lithium batteries used by the average person in their electronic devices.



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Power banks with a capacity of more than 160Wh are strictly prohibited by various airlines internationally. For example, flyers often wonder if a 20000mah power bank is allowed on flights. As 20000mah makes for less than 100 watt-hours, it can be carried in cabin luggage.

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In summary: Power banks are allowed on planes in carry on bags only. Power banks are not allowed in checked luggage / cargo luggage. You can bring power banks up to 27,000 mAh on most passenger aircraft.

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Spare (uninstalled) lithium metal batteries and lithium ion batteries, electronic cigarettes and vaping devices are prohibited in checked baggage. They must be carried with the passenger in carry-on baggage.

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Consumer-sized batteries (up to 2 grams of lithium per battery) may be carried. This includes all the typical non-rechargeable lithium batteries used in cameras (AA, AAA, 123, CR123A, CR1, CR2, CRV3, CR22, 2CR5, etc.)

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Power banks should be carried in carry-on luggage, not checked baggage. Power banks should have a capacity of no more than 100 watt-hours or 20000 milliamp hours. Above these values, airlines may require carrier approval or impose restrictions.

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Ryanair — power bank must be carried in carry-on baggage. Maximum capacity: 100 Wh or 27000 mAh.

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Lithium-ion (rechargeable) batteries and portable batteries that contain lithium-ion can only be packed in carry-on baggage. They're limited to a rating of 100 watt hours (Wh) per battery. With airline approval, you can bring two larger spare batteries (up to 160 Wh).

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Lithium batteries can catch fire
While not all batteries are prohibited in checked luggage, lithium batteries are considered hazardous and should not be packed in checked bags. If a lithium battery overheats and catches fire inside the cargo hold, the fire can quickly spread and become difficult to control.

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Just remember with lithium ion, you can carry four batteries under 100 watts on the airplane with you. You can't check them if they're loose. You can check them if they're in other devices. You can also take two up to 160 watt or sometimes one 300 watt battery with special permission.

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Is toothpaste considered a liquid by the TSA? Yes, toothpaste must adhere to the 3-1-1 rule for liquids and gels. Toothpaste can be brought through TSA security in your carry-on as long as it is 3.4 ounces (100 milliliters) or less and placed in a 1-quart bag.

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Lithium batteries, which power everyday devices, can catch fire if damaged or if battery terminals are short-circuited. Devices containing lithium metal batteries or lithium ion batteries, including – but not limited to – smartphones, tablets, cameras and laptops, should be kept in carry-on baggage.

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