Batteries Allowed in Checked Bags: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.
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When a carry-on bag is checked at the gate or at planeside, all spare lithium batteries and power banks must be removed from the bag and kept with the passenger in the aircraft cabin. The battery terminals must be protected from short circuit.
Lithium batteries with 100 watt hours or less in a deviceSpare (uninstalled) lithium ion and lithium metal batteries, including power banks and cell phone battery charging cases, must be carried in carry-on baggage only. Lithium metal (non-rechargeable) batteries are limited to 2 grams of lithium per battery.
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.
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.
A dry AA(A) battery (type Alkaline, NiMh, NiCd,…) for personal small items such as a pocket torch or a radio are allowed as long as they are inside the device or enclosed in a strong package.
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.
What can happen if I accidentally forgot some portable electronics that use lithium batteries in my check in bag? Generally nothing happens. You can carry most electronic devices with installed lithium batteries in checked luggage. You cannot carry loose batteries or ones in external chargers.
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.
The TSA's “Can I Bring” search tool breaks it down for you: Dry batteries (your common household AA, AAA, C, and D batteries) are allowed in both carry-on and checked bags. Lithium batteries with 100 watt hours or less in a device are allowed in carry-on bags and checked bags, with some limits.
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.)
Firearms and ammunition, as well as any replicas or imitations. Explosives and flammable items, such as fireworks, gas, and aerosols. Poisonous and toxic substances, including pesticides and certain chemicals. Lithium batteries and other hazardous materials, as these can pose a safety risk if not handled properly.
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.
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.
Such a hazard, in fact, that the FAA has issued a new warning on the dangers such batteries could pose to aircraft, and the could on board, essentially calling for their ban. Lithium batteries present a risk of both igniting and fueling fires in aircraft cargo/baggage compartments.