The FAA and TSA have specific regulations for vape batteries. Violating them can result in confiscation, fines, or being denied boarding.

TSA/FDA Rules (as of 2026)

• Carry-on only: All vape devices and spare batteries must travel in carry-on luggage. Checked baggage is prohibited — the cargo hold lacks fire suppression for lithium battery fires, and flight crews can't respond to an incident in checked bags.
• Terminal protection: External 18650/21700 batteries must have terminal covers or be in plastic cases. Loose batteries in a carry-on are flagged by security and may be confiscated.
• Device in bag, not in use: TSA rules prohibit using vape devices on aircraft. The device should be turned off and stored.
• Spare battery limit: Most airlines limit spare batteries to 2-4 per passenger. Check your airline's specific policy before flying.
• Watt-hour limit: Batteries up to 100Wh are generally permitted. A standard 18650 at 3.7V/2500mAh = 9.25Wh — well within limits. High-capacity battery packs in advanced mods may approach the limit.