You cannot bring batteries rated higher than 160Wh or 8g of lithium. You must pack your spare batteries in your carry-on bags. They are not allowed in your checked-in baggage.
It is allowed to take non-spillable batteries on a plane as long as they do not exceed 100 watts. Non-spillable batteries with a wattage rating of up to 100 watts are allowed to be packed in carry-on or checked luggage.
Leaving a battery in your checked luggage can pose safety risks. Lithium batteries, which power many everyday devices, can catch fire if damaged or if battery terminals are short-circuited. If a battery catches fire inside your luggage, it can spread quickly and cause injuries or fatalities.
Lithium batteries can produce dangerous heat levels, cause ignition, short circuit very easily, and cause inextinguishable fires. That's why renowned aviation authorities, including those in the USA, have banned lithium batteries when traveling.
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).
Are checked bags scanned for these lithium batteries before loaded — Dan K., Va. A: The bags are scanned for security, not specifically for lithium batteries. If you leave a lithium battery in your bag it will travel with you.
Batteries are picked up very vividly by baggage scanner machines used in the airport security process, and they are diligently assessed by security. This is why laptops are required to be removed from carry-on luggage before the screening unless you have TSA Pre-Check.
Except for spare (uninstalled) lithium batteries, all the batteries allowed in carry-on baggage are also allowed in checked baggage; however, we recommend that you pack them in your carry-on bag whenever possible.
When damaged, short-circuited or overheated, these batteries can catch fire. You should carry your portable electronic devices (PEDs, such as cameras, laptops and phones) in your hand baggage (carry-on), and not in your checked baggage.
Deep-learning algorithms can detect lithium-ion batteries in airport security.
Lithium ion batteries 100–160WH
They're usually between 100 and 160Wh. If you want to carry these kind of lithium batteries with you, you must get approval from your airline before flying. If the battery is in a device, you may carry it in either checked or carry-on baggage.
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.
The way to catch stray lithium-ion batteries is to blast X-rays on the luggage. When exposed, the electromagnetic radiation passes through and bounces off various things inside the bag differently depending on the density of the many types of material.