Batteries on Planes: Chemistry, Spare Cells and Power Banks
Battery rules depend on chemistry and whether the cell is installed. Check FAA packing guidance and the separate 2026 power-bank restrictions.
Sources and scope
Source-based research; no hands-on test or specialist review claimed.
Non-lithium dry-cell guidance requires protection even where no numerical quantity cap is stated.
FAA / United States passenger framework
Dry CellSource review: · Codex (AI source review)
Lithium packing and approval depend on installed/spare status and rating.
FAA passenger guidance; separate rules for mobility equipment
Quantity limits; Spare batteries; damaged or recalled batteriesSource review: · Codex (AI source review)
Identify the battery chemistry, whether it is installed or spare, and the rating on its label. An AA-shaped rechargeable cell is not necessarily governed by the same rule as an alkaline AA. Power banks also have their own 2026 restrictions.
Non-lithium dry cells
For the US passenger framework, the FAA dry-cell guidance lists alkaline, nickel-metal-hydride and nickel-cadmium batteries without a numerical quantity cap. That does not remove the packing requirement: protect them against damage and prevent exposed terminals from touching metal. Retail packaging, a battery case or individually protected terminals are useful options. A charger alone is not short-circuit protection.
Lithium cells and devices
The FAA lithium guidance distinguishes spare cells from batteries installed in equipment. Spare lithium cells and power banks belong in the cabin, including when your main bag is gate-checked. Protect terminals. Damaged or recalled batteries require a separate check and must not be treated as ordinary permitted spares.
For ordinary lithium-ion batteries, 100 Wh and 160 Wh are different thresholds; the higher category can need operator approval and quantity restrictions. Do not extend an ordinary consumer-battery rule to mobility equipment, which has separate provisions. Lithium-metal batteries use lithium-content limits, not just watt-hours; read the manufacturer's label.
Power banks in 2026
See our power-bank guide for the 27 March 2026 ICAO change described by IATA: a maximum of two power banks and restrictions on charging. State implementation and airline conditions matter. The dry-cell “no quantity limit” above does not apply to power banks.
Before packing
Record the model, chemistry, Wh or lithium content, number of spares and every operating airline. For a connection, check each carrier's published dangerous-goods policy. Do not guess a cell's Wh from USB output wattage or assume that a small coin cell can go in checked baggage solely because it is small.
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