9V Battery
Standard alkaline 9V batteries are allowed in carry-on and checked bags without restriction.
Carry-on
Allowed
Checked
Allowed
Carry-on details
Allowed. Ordinary alkaline 9V batteries (the kind used in smoke detectors and small electronics) are dry-cell batteries, not lithium, so they carry none of the fire-risk restrictions lithium batteries do — bring as many as you need.
Checked-bag details
Allowed. Alkaline 9V batteries can be packed in checked baggage without restriction as well.
Special instructions
This applies to standard alkaline 9V batteries. Rechargeable lithium 9V batteries (less common, but sold for smoke detectors and instruments) follow the spare lithium battery rules instead — carry-on only.
FAQ
- Are lithium 9V batteries treated differently than alkaline ones?
- Yes — rechargeable lithium 9V batteries are treated as spare lithium batteries and must go in carry-on. Standard single-use alkaline 9V batteries have no such restriction and can go in either bag.
Related items
Source: TSA — What Can I Bring? · Last verified: 2026-07-31
Final decision rests with the security officer at the checkpoint.