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Can I Carry It? — verified carry-on guide

Can You Bring Batteries on a Plane?

Category: Electronics & Batteries

Direct Answer (2026 Official Rules)
Cabin: ✓ YES Hold: ✓ YES

Yes — you can bring batteries on a plane in your carry-on luggage. AA/AAA/C/D/9V/button cells: both bags.

Verified against published 2026 TSA (United States) & CATSA (Canada) security screening databases.

On this page · 9 sections

⚖️ Why This Rule Exists: Aviation Cargo Fire Safety & Thermal Runaway Regulations (49 CFR § 175.10)

Lithium-ion batteries carry a risk of thermal runaway if crushed, short-circuited, or overheated. Because aircraft cargo fire suppression systems (Halon 1301) cannot reliably extinguish an uncontained lithium battery fire in the cargo hold, aviation safety regulations (FAA Pack Safe and ICAO Annex 18) require spare batteries and portable electronics to be transported in the passenger cabin where flight attendants can promptly deploy thermal containment bags.

Decision Threshold: Verify that battery capacity is under 100 Wh. If between 101–160 Wh, obtain airline approval (max 2 spares). If over 160 Wh, carriage is prohibited on passenger aircraft.

Rules by security authority

United States — TSA

Carry-on

Yes

Yes — everyday alkaline cells fly in either bag; loose lithium batteries and power banks are cabin-only.

Checked bag

Yes

Alkaline/NiMH batteries: yes. Spare lithium batteries: no, they are cabin-only — installed-in-device batteries are fine in checked bags.

Rule conditions: AA/AAA/C/D/9V/button cells: both bagsSpare lithium batteries + power banks: carry-on onlyLithium limits: ≤ 100 Wh (ion) / ≤ 2 g lithium (metal)Cover terminals on spares — tape, caps, or a battery case

Flying internationally? Security follows the country you depart from — the authority above applies at your departure airport. Customs at arrival is separate.

🔍 Security Checkpoint & X-Ray Screening Advice

In standard 2D X-ray lanes, remove laptops and large power banks from your bag and place them flat in a dedicated bin with nothing above or below them. In modern 3D CT scanner lanes, they may remain packed inside your carry-on bag.

Learn more about scanner differences and traveler rights in our Airport Security Screening Guide →

⚠️ Common Traveler Mistake to Avoid

The Mistake: Packing spare power banks or loose camera batteries into checked luggage or forgetting them inside a roller bag during a forced gate-check.

How to Avoid It: Always keep all spare batteries, power banks, and portable chargers in your personal item backpack so they stay with you in the aircraft cabin.

🔋 Battery watt-hour calculator

Power banks show mAh, airlines limit Wh. Under 100 Wh flies free in carry-on; 100–160 Wh needs airline approval.

How to Pack Batteries (AA / Lithium) for a Flight

The line that matters is spare versus installed: anything rechargeable and loose (power banks, camera batteries, vape cells) flies in the cabin with taped or capped terminals; a battery inside its device can go in either bag. Alkaline AAs are unrestricted — just stop them shorting on keys or coins.

Batteries (AA / Lithium) on a plane — FAQs

Can you bring Batteries in a carry-on?

Yes — everyday alkaline cells fly in either bag; loose lithium batteries and power banks are cabin-only.

Can you pack Batteries in checked luggage?

Alkaline/NiMH batteries: yes. Spare lithium batteries: no, they are cabin-only — installed-in-device batteries are fine in checked bags.

Why are there rules for batteries on a plane?

Lithium-ion batteries carry a risk of thermal runaway if crushed, short-circuited, or overheated. Because aircraft cargo fire suppression systems (Halon 1301) cannot reliably extinguish an uncontained lithium battery fire in the cargo hold, aviation safety regulations (FAA Pack Safe and ICAO Annex 18) require spare batteries and portable electronics to be transported in the passenger cabin where flight attendants can promptly deploy thermal containment bags.

Can I bring AA batteries on a plane?

Yes — alkaline and other common dry batteries (AA, AAA, C, D, 9V, button cells) are allowed in carry-on and checked bags. Cover the terminals of loose ones to prevent short circuits.

Can lithium batteries go in checked luggage?

Spare (uninstalled) lithium batteries and power banks cannot — they are cabin-only under FAA rules, limited to 100 watt-hours (ion) or 2 grams of lithium (metal). Batteries installed in a device are fine in checked bags.

Last verified:

Verified against official sources. Rules change — for high-stakes items, confirm with your airline and the screening authority. Our verification method →