Two spare fuel cell cartridges may be carried. See the FAA Regulations for more information on quantity limits.
For international flights check with your airline as international regulations may vary from domestic regulations.
Fuel Cells Used to Power Portable Electronic Devices and Spare Fuel Cell Cartridges (Flammable Liquid/Corrosive Material)
Carry On Bags:
Yes (Special Instructions)
Checked Bags:
Yes (Special Instructions)
The final decision rests with the TSA officer on whether an item is allowed through the checkpoint.