Can you bring Fuel Cells Used to Power Portable Electronic Devices and Spare Fuel Cell Cartridges (Flammable Gases or Water-Reactive Material) on a plane?
Coop checked the book. Here's the ruling for Fuel Cells Used to Power Portable Electronic Devices and Spare Fuel Cell Cartridges (Flammable Gases or Water-Reactive Material):
What the TSA says
Two spare fuel cell cartridges may be carried in carry-on baggage only. Each fuel cell must be marked by the manufacturer "Approved for carriage in aircraft cabin only". Each fuel cell cartridge (not the electronic device) must be marked with the maximum quantity and type of fuel in the cartridge. Though allowed in both carry-on and checked baggage according to international regulations, spare fuel cell cartridges containing flammable gases and water reactive substances are only allowed in carry-on baggage by U.S. regulations. See FAA Regulations for more information.
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Based on official TSA guidance. The final decision rests with the TSA officer at the checkpoint.