Can you bring Lithium batteries with 100 watt hours or less in a device on a plane?
Coop checked the book. Here's the ruling for Lithium batteries with 100 watt hours or less in a device:
What the TSA says
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. 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. These limits allow for nearly all types of lithium batteries used by the average person in their electronic devices. This instruction covers spare lithium metal and spare rechargeable lithium ion batteries for personal electronics such as cameras, cell phones, laptop computers, tablets, watches, calculators, etc. This instruction also includes external battery chargers (portable rechargers and power banks) containing a lithium ion battery. For more information, see the FAA regulations on batteries. For lithium batteries that are installed in a device (laptop, cell phone, camera, etc.), see FAA regulations for "portable electronic devices, containing batteries".
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Based on official TSA guidance. The final decision rests with the TSA officer at the checkpoint.