Do rechargeable batteries have a watt-hour limit like lithium batteries?

No — NiMH rechargeable batteries use a different chemistry and aren't subject to the watt-hour limits that apply to lithium-ion batteries. Protect the terminals, but there's no capacity cap.

Rechargeable AA/AAA Batteries (NiMH)

NiMH rechargeable AA/AAA batteries are allowed in carry-on and checked bags without the watt-hour limits that apply to lithium batteries.

Carry-on

Allowed

Checked

Allowed

Carry-on details

Allowed. NiMH (nickel-metal hydride) rechargeable batteries use a different chemistry than lithium-ion and don't carry the same fire-risk profile, so they aren't subject to the watt-hour capacity limits or carry-on-only rule that apply to lithium batteries.

Checked-bag details

Allowed. NiMH batteries can be packed in checked baggage without restriction as well.

Special instructions

This applies to NiMH batteries specifically. Rechargeable lithium-ion AA/AAA-style batteries (less common, but sold under some brands) follow the spare lithium battery rules instead — carry-on only.

FAQ

Do rechargeable batteries have a watt-hour limit like lithium batteries?: No — NiMH rechargeable batteries use a different chemistry and aren't subject to the watt-hour limits that apply to lithium-ion batteries. Protect the terminals, but there's no capacity cap.

Related items

Sources: FAA — PackSafe (Hazardous Materials), TSA — What Can I Bring? · Last verified: 2026-08-02

Final decision rests with the security officer at the checkpoint.