Battery planning before a flight
Compare power bank limits across flight segments
Calculate a power bank's watt-hours from rated mAh and voltage, then compare separately entered, dated policies for up to ten flight segments. FAA rules are labeled for U.S. passenger flights.
Calculate the watt-hours (Wh) from a power bank's rated capacity and battery voltage. Add a separate policy record for each operating airline or flight segment you need to check. Enter only limits copied from that airline's current policy; this page does not maintain carrier limits.
Operating airline policies
For a codeshare or separately booked connection, check the airline operating each flight. Use the same battery count for each segment below. A Wh limit, quantity limit, or both may be entered.
Enter the capacity and rated battery voltage shown for the power bank.
United States passenger reference
The FAA says its U.S. passenger rules allow rechargeable batteries rated 0–100 Wh; 101–160 Wh requires air-carrier approval; and batteries over 160 Wh are forbidden. Spare lithium batteries and power banks must be carried in the cabin, not checked. Airlines may set stricter quantity or capacity limits. These are U.S. rules, not a universal decision for every itinerary.
Use the battery's marked Wh rating when available. Otherwise, the FAA's calculation is: mAh ÷ 1,000 × volts = Wh. The voltage must be the rated battery voltage used for that capacity, not an assumed value.
Check the exact baggage rule for every airline on your itinerary, including separately booked or codeshare legs. For bag dimensions, use the carry-on size checker; for checked-bag fees, use the checked-bag cost comparison. This calculator cannot determine dangerous-goods compliance or airline approval.
Sources and scope
- FAA PackSafe: Airline Passengers and Batteries (U.S. passenger thresholds, Wh formula, spare-battery placement and airline-specific limits; checked 3 Nov 2026)
- IATA: Safe Travel with Lithium Batteries (check the battery rating and confirm current airline policy; checked 3 Nov 2026)
Do not use the USB output voltage as a substitute unless the manufacturer identifies it as the battery's rated voltage. Damaged or recalled batteries may be prohibited. Confirm your exact battery, quantity, placement and itinerary with the airline and applicable authority.
How it works
Enter the rated mAh and voltage shown for the power bank. Add a separate segment for each operating airline you want to check, then enter its current per-battery Wh and/or quantity limit, policy URL and check date. Limits are traveler-entered and are not stored by this site.
Good to know
How do I calculate watt-hours from mAh?
Use the rated battery voltage: divide mAh by 1,000, then multiply by volts. If the power bank already shows Wh, use that marked rating and confirm it with the manufacturer or airline; this page does not verify product labels.
Can I check several airlines on one itinerary?
Yes. Add a separate dated policy record for each operating airline or segment, including separately booked and codeshare legs. The same battery capacity and count are compared against each record independently; verify each airline's current terms and any applicable authority rules.
Does a result within every entered limit mean the power bank is allowed?
No. It compares arithmetic only with the limits and policy records you entered. Check each operating airline's current rules, applicable national authority, cabin placement, damaged-battery restrictions and any other conditions. FAA thresholds here are U.S.-specific.
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