Flying With a CPAP: FAA Battery Rules and the Delta 3 Max

Planning to fly to a campsite with your CPAP? The FAA’s lithium battery rules decide what comes with you on the plane. A CPAP-sized battery under 100Wh can usually ride in your carry-on. The EcoFlow Delta 3 Max, at 2,048Wh, is a drive-to-camp power station. This guide covers how the watt-hour limits work, how to read a battery label, what to pack for the flight and how to set up power once you land.

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I’m not a medical professional, and this isn’t medical advice. Talk to your doctor, your equipment supplier (DME) and your airline before you travel with medical equipment.

The FAA Watt-Hour Limits at a Glance

The FAA sorts lithium-ion batteries by watt-hours (Wh). The same limits apply to CPAP batteries, laptop power banks and portable power stations.

Battery size	Carry-on	Checked bag	Notes
Up to 100Wh	Yes	Only when installed in a device	Spare batteries go in carry-on, with the terminals protected
101–160Wh	With airline approval	Only when installed in a device	Spares are limited to two per passenger
Over 160Wh	No	No	This covers most portable power stations, including the Delta 3 Max

Rules can differ by airline and by country, so check the FAA’s PackSafe pages and your airline’s battery policy before you book.

How to Read the Watt-Hours on a Battery

Most travel batteries print their Wh rating on the label. If yours lists only volts and amp-hours, the math is simple:

Wh = volts × amp-hours. For milliamp-hours, divide by 1,000 first.

A 14.4V, 6.7Ah CPAP battery: 14.4 × 6.7 ≈ 96Wh, which is under the 100Wh line.
A 25,600mAh power bank at 3.7V: 3.7 × 25.6 ≈ 95Wh, also under 100Wh.
The Delta 3 Max: 51.2V × 40Ah = 2,048Wh, about 12.8 times the 160Wh ceiling.

These are worked examples. Always use the rating printed on your own battery.

Packing a CPAP for the Flight

Carry it on. Your CPAP is medical equipment, and US airlines generally don’t count it toward your carry-on allowance. Ask your airline to confirm.
Expect screening. TSA usually asks you to take the CPAP out of its case for the X-ray. A clear plastic bag keeps the mask and tubing clean.
Empty the humidifier tank before you fly, and buy distilled water at your destination.
Bring the paperwork. A copy of your prescription and the device label help if anyone asks.
Plan in-flight use early. If you want to use the CPAP on board, most airlines ask for notice and a battery that’s under 100Wh. Some ask for battery time of 150% of the flight.

Portable Oxygen Concentrators

Portable oxygen concentrators (POCs) follow their own process. The device needs an FAA-acceptance label, and airlines typically ask you to bring enough batteries for the whole journey plus a buffer. Each POC battery has to meet the same 100Wh and 160Wh limits. Book with the airline’s medical desk well before your trip.

Powering Camp After You Land

The Delta 3 Max stays on the ground, so plan your camp power around the destination:

Drive it there. For road trips, the Delta 3 Max is one of the lightest 2kWh stations at 44.8 lb, and it fits behind a seat.
Rent or borrow a station near your destination. Some outfitters and camping-gear rental shops rent power stations.
Ship it by ground ahead of time. Large lithium batteries can’t fly, but many ground carriers accept them when they’re packed to the carrier’s rules. Ask the carrier before you send it.
Book a powered site. A site with a hookup lets your CPAP’s normal AC supply do the work, with a travel battery as a backup.

A Simple Fly-In CPAP Power Plan

Item	Where it travels	Why
CPAP and mask	Carry-on	Medical device, kept with you
CPAP battery up to 100Wh	Carry-on	Within the FAA limit for carry-on
Power bank up to 100Wh	Carry-on	Phone and headlamp charging
Delta 3 Max	Car, ground shipping or rental at the destination	Over 160Wh
12V DC cord for the CPAP	Checked or carry-on	Lets you run from a station’s 12V socket at camp

Using the Delta 3 Max at a Drive-In Site

If you can drive, the Delta 3 Max makes a strong CPAP camp partner. Its 12V car socket supplies up to 126W, enough for a CPAP maker’s DC cord or converter, and it skips the AC inverter’s idle draw. Before your first trip, set the DC timeout to “Never” in the EcoFlow app. Then run one full test night at home. For nights-per-charge estimates, see our Delta 3 Max CPAP runtime guide.

Fly-In vs Drive-In at a Glance

	Fly-in trip	Drive-in trip
Main power	Travel battery up to 100Wh, a hookup or a rental station	Delta 3 Max on DC
Nights covered	About one per travel battery (depends on the battery and settings)	Several nights per charge, more with solar
Recharging	Hookup or rental	Solar up to 500W, car or wall

Delta 3 Max Air Travel FAQ

Can I take the EcoFlow Delta 3 Max on a plane?

No. At 2,048Wh it’s well above the FAA’s 160Wh limit for passenger aircraft, both in carry-on and checked bags.

What size CPAP battery can I fly with?

Batteries up to 100Wh are generally allowed in carry-on. Batteries from 101Wh to 160Wh need airline approval, and anything larger isn’t allowed. Check your airline’s policy.

Does my CPAP count as a carry-on bag?

US airlines generally treat a CPAP as medical equipment that doesn’t count toward your carry-on limit. Confirm with your airline when you book.

Can I put spare CPAP batteries in checked luggage?

No. Spare lithium batteries belong in your carry-on, with the terminals taped or in a case.

What’s the easiest way to have power at a fly-in campsite?

A powered site, a rented station or a station shipped ahead by ground are the simplest options.

For the full station breakdown, read our EcoFlow Delta 3 Max review, or check the EcoFlow Delta 3 Max price on Amazon.

Sources: FAA PackSafe lithium battery guidance; TSA screening guidance for medical devices; EcoFlow DELTA 3 Max user manual and US spec sheet; our worked examples.