Can I Carry Batteries In My Checked Luggage. Batteries with a Wh rating of 160 or less are allowed by the FAA but those with a rating from 101 to 160 may only fly with your airlines approval. Its only uninstalled batteries that are prohibited.
You can also take a maximum of two spare batteries. Batteries in chargers or similar devices are not considered installed. Carry-on bag - yes.
Here is the relevant screengrab from the TSA website.
Compressed gases - deeply refrigerated flammable non-flammable and poisonous such as butane oxygen liquid nitrogen aqualung cylinders and compressed gas cylinders. Passengers are permitted to travel with lithium ion batteries that contain a maximum of 160-watt hours per battery. Corrosives such as acids alkalis mercury and wet cell. When in doubt leave it out.
