Spare (uninstalled) lithium ion and lithium metal batteries, including power banks and cell phone battery charging cases, must be carried in carry-on baggage only. With airline approval, passengers may also carry up to two spare larger lithium ion batteries (101–160 Wh) or lithium metal batteries (2-8 grams).
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Checked Bags: NoSpare (uninstalled) lithium ion and lithium metal batteries, including power banks and cell phone battery charging cases, must be carried in carry-on baggage only.
Methods include: leaving the batteries in their retail packaging, covering battery terminals with tape, using a battery case, using a battery sleeve in a camera bag, or putting them snugly in a plastic bag or protective pouch.
If these devices are packed in checked baggage, they should be turned completely off, protected from accidental activation and packed so they are protected from damage. Spare (uninstalled) lithium metal batteries and lithium ion batteries, electronic cigarettes and vaping devices are prohibited in checked baggage.
For example, flyers often wonder if a 20000mah power bank is allowed on flight. As 20000mah makes for less than 100 watt-hours, it can be carried in cabin luggage.
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.
Spare (uninstalled) lithium ion and lithium metal batteries, including power banks and cell phone battery charging cases, must be carried in carry-on baggage only.
Damaged, defective or recalled lithium batteries must not be carried in carry-on or checked baggage if they are likely to be a safety concern by overheating or catching on fire. When in doubt, leave it out. Check the FAA's Pack Safe website for the rules on carrying these items and other dangerous goods in baggage.
How Does TSA Detect Lithium Batteries? The answer lies in the power of X-rays! Through a process called X-ray absorption, TSA agents are able to identify lithium-ion batteries and remove them for further inspection. When X-rays pass through a piece of luggage, they create an image on the other side.
Size limits: 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.
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.
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.
The battery voltage must not exceed 12 volts and the battery watt hour rating must not exceed 100 watt hours. Battery-powered equipment must be protected against accidental activation and the evolution of heat, and damage to the terminal posts.