Chris Ross
Contributor
It is only spare lithium batteries that cannot be checked. Installed are OK.
https://www.faa.gov/about/office_or...fo/media/Airline_passengers_and_batteries.pdf
Yes but in the link I described the wording is different:
"Devices containing lithium metal or lithium ion batteries (laptops, smartphones, tablets, etc.) should be carried in carry-on baggage when possible. When these devices must be carried in checked baggage, they should be turned completely off, protected from accidental activation, and packed so they are protected from damage.
Some of which is open to interpretation and American Airlines asks you to remove batteries from devices in checked baggage. Whether the AA rules are enforced is another story.
If you don't know the W-hr rating of your batteries check the manufacturer's website and contact them if they don't provide the data. Most new batteries should have the W-hr rating on the label, unfortunately often in fine print. The rule is normally up to 100 W-hrs no restrictions as long as it is protected from shorts. Basically this means having a case or a cap to protect the terminals. you also need to be able to show the light can't accidentally be turned on. IF you are flying in other countries download and print your airline's restrictions.