Top 4 CPAP Batteries for Travel & Backup Power (2027)
By Clay RollysonA CPAP battery is one of those purchases you make once and then forget about until the night you actually need it. A hurricane knocks the power out. You are three days into a camping trip. You are on a red-eye to London and you would rather not lose a night of therapy. The right battery makes all of that a non-event.
The problem is that CPAP batteries are not sold in a way that makes them easy to compare. Some list watt-hours, some list nights, some list nothing at all. Below are the four we sell and actually stand behind, ranked for how most people will use them, with the specs laid out side by side so you can see exactly what you are paying for.
Watch the full comparison
Clay walks through all four batteries on camera, side by side, so you can see the size difference and how each one connects. Everything below is written up in detail if you would rather read it.
Table of contents
Quick comparison of all four batteries
| Universal 20000mAh | Freedom 160 | Portable Outlet X9 | NiteOwl | |
|---|---|---|---|---|
| Price | $189.00 | $349.99 | $369.00 | $349.00 |
| Capacity | 74Wh (20,000mAh) | 160Wh | 159Wh | 150Wh |
| Weight | 0.91 lbs | 2.2 lbs | 3.0 lbs | 1.7 lbs |
| Dimensions | 3.5″ × 5.9″ × 1″ | 7.8″ × 5.1″ × 1″ | 6″ × 9.25″ × 1.5″ | 8.7″ × 4.8″ × 0.9″ |
| Connection | DC adapters, 100W USB-C PD, 2 USB-A | DC adapters, QC 3.0 USB | Standard 110V AC outlet, no adapters | DC adapters, QC 3.0 USB |
| Typical run time | 1–2 nights (AirSense 10/11), 2–3 nights (AirMini) | 24 hrs (AirSense 10), 38 hrs (AirMini) | 10–12 hrs (home CPAP), 16+ hrs (travel CPAP) | 1–3 nights |
| Recharges from | USB-C, wall, car, solar | Its own AC supply, or optional DC charger | Wall, car, solar | Your existing CPAP power cord |
| Works in line as backup | No, connect it when needed | Yes | Yes, true UPS | Yes |
| Flies without airline approval | Yes, under the 100Wh limit | No, call your airline first | No, call your airline first | No, call your airline first |
| Charges phones & laptops | Yes, up to 100W | Phones only | Phones and tablets | Phones only |
| Doubles to a second battery | No | Yes (+$231) | No | Yes (+$270) |
| Warranty | 12 months | 1 year | 1 year | 1 year |
Swipe the table sideways to see all four batteries.
Short on time? The Universal 20000mAh Battery at $189 is the right answer for most people. Or browse every option in our CPAP power collection.
What all four have in common
Before the differences, the things that are true of every battery on this page:
- A one-year warranty on all four.
- Adapters included in the box. Between them these batteries cover roughly 90% of the CPAP machines we sell. Coverage varies by battery, so check the compatibility list on each product page, and call us if your machine is an unusual one.
- All four are legal to fly with. Every one sits under the FAA's 160Wh ceiling, and you may carry up to two batteries. What differs is whether you need to arrange approval first.
- All four need your humidifier switched off. This is not a suggestion. Leave heated humidification or heated tubing running and you will get almost no useful run time out of any battery here.
How to choose a CPAP battery
Four things decide whether a battery will work for you. Everything else is detail.
Watt-hours, not milliamp-hours
Watt-hours (Wh) is the number that actually tells you how long a battery will run. Milliamp-hours only mean something once you also know the voltage. Every airline rule is written in watt-hours too, so it is the number worth learning.
Your humidifier is the biggest variable
Heated humidification and heated tubing can consume more power than the blower motor itself. Running them off a battery can cut your run time by more than half. This is why two batteries with nearly identical capacity can advertise very different numbers: one is quoting with the humidifier off, the other with it on low. If you plan to sleep off-grid, turn the humidifier and heated tube off and use a saline nasal spray instead.
DC adapters vs. a standard AC outlet
Most CPAP batteries connect through a DC adapter matched to your specific machine, which is efficient and compact. One battery on this list, the Portable Outlet X9, gives you a regular wall outlet instead, so you plug in the same power brick that came with your CPAP. That is more convenient and more universal, but AC conversion wastes some energy, which is why its run times look shorter than its capacity suggests.
Air travel rules
The FAA and TSA allow lithium-ion batteries up to 100Wh in carry-on baggage with no advance permission. Between 101Wh and 160Wh, you are allowed a maximum of two, but only with your airline's approval arranged ahead of time. Nothing over 160Wh is permitted, and no lithium battery of any size may go in checked luggage. If you fly often, staying under 100Wh removes a phone call from every trip.
#1 Universal 20000mAh CPAP Battery — $189
Why it takes the top spot
Prefer to watch? Jump straight to the Universal in the video.
Start with the size. At 3.5″ wide by 5.9″ long and a single inch thick, the Universal takes up roughly half the space of the Freedom 160 and about a quarter of the Portable Outlet X9. It is a little over half the size of the NiteOwl, which is nearly twice as long. At 0.91 lbs it also weighs a little over half what the next lightest battery here does, and less than a third of the heaviest. At well under a pound it slips into a laptop sleeve, a glovebox, or the pocket of a CPAP travel bag without a fight.
That size is what makes it different from every other battery on this list. The others are single-purpose objects that live in a closet until something goes wrong. This one is small enough that it earns a spot in your everyday bag, which means it is already with you when the power goes out or the flight gets delayed.
The ports are the second reason. Alongside the DC output that runs your CPAP, you get a 100W USB-C Power Delivery port that works in both directions and two USB-A ports. That is enough to fast-charge a laptop, top off a phone and a tablet at the same time, or recharge the battery itself quickly from a wall charger. During an outage, one device keeps the CPAP running at night and the whole family's phones charged during the day.
Third is the DC output itself, which is adjustable from 5V to 24V in 0.1V steps. Plug in the adapter for your machine and it converts to the voltage that machine expects, and you can nudge it manually if you have an unusual requirement. Most batteries offer two or three fixed voltages. That flexibility also means the battery stays useful if you change CPAPs later.
Recharging is where it genuinely stands alone. The USB-C port works as an input as well as an output, so you can top this battery up with the same cable you charge your phone with. None of the other three can do that. They each need their own AC supply, a dedicated DC charger, or your CPAP power cord. You can also recharge the Universal from a wall adapter, a 12V car socket, or a solar panel. The LED display shows exactly how much charge is left instead of four vague bars.
As for how it performs in practice, we ran one overnight on an AirSense 11 with the humidifier off. After nine hours of therapy it still had about 30% left.
And then there is travel. At 74Wh, it sits comfortably under the 100Wh threshold, so it goes in your carry-on with no approval, no paperwork, and no conversation at the gate. The other three all sit above 100Wh, so each of them needs clearing with the airline in advance.
Universal 20000mAh CPAP Battery — $189. In stock and ready to ship, with free shipping on orders over $49.
Specifications
- Capacity: 20,000mAh / 74Wh (18650 & 21700 lithium cells)
- Dimensions: 3.5″ W × 5.9″ L × 1″ H
- Weight: 0.91 lbs
- Input: DC 5V–24V (120W max), USB-C
- Output: 100W USB-C PD max; 120W DC max; adjustable 5V–24V in 0.1V increments
- Run times: AirMini 2–3 nights · Luna TravelPAP 2–3 nights · AirSense 11 1–2 nights · AirSense 10 1–2 nights · Luna G3 1–2 nights
- Recharging: USB-C, AC/DC wall adapter, 12V car socket, solar panel
- Protections: over-charge, over-discharge, short circuit, low tension
- Warranty: 12 months
- In the box: battery, USB-C charging cable, CPAP connection adapters, user manual
Best for: frequent flyers, ResMed and Luna owners, campers and RV travelers, anyone who wants one device that covers both the CPAP and the rest of their electronics, and anyone who does not want to spend $350 or more on backup power.
Look elsewhere if: you need three or more nights of run time from a single charge, or you want a battery that lives permanently in line behind your CPAP as automatic outage backup. This one is not designed to sit in line the way the other three are, so it is a travel and off-grid pick rather than a set-and-forget home pick.
Shop the Universal 20000mAh Battery
#2 Freedom CPAP Battery 160 — $349.99
Why it ranks here
Prefer to watch? Jump straight to the Freedom 160 in the video.
The Freedom 160 is the run-time champion of this group. It packs 160Wh into a slim slab that is still only an inch thick, and the published run times are genuinely long: 24 hours on an AirSense 10, 30 hours on an AirSense 11, 38 hours on an AirMini, and 40 hours on a DreamStation 2. Those figures assume a fixed pressure of 10 cm and the humidifier switched off, which is the honest way to measure it.
Add the dual battery option and those numbers double. Two Freedom 160s bridged together will run an AirSense 11 for 60 hours or an AirMini for 76. For a week in the backcountry or an extended stay somewhere power is unreliable, that is hard to beat.
Charging is its weak spot. There is no USB input, so you recharge it from the AC supply that comes in the box or from an optional DC charger, which also opens up car and solar charging. That is one more thing to remember to pack.
The trade-offs are size and flying. At 7.8″ long and 2.2 lbs it is noticeably bigger and heavier than the Universal, and at 160Wh it sits in the band that requires airline approval before you board. It also has a single USB port for other devices rather than the Universal's three.
Specifications
- Capacity: 160Wh
- Dimensions: 7.8″ × 5.1″ × 1″
- Weight: 2.2 lbs
- Output: 12V–24V, 8A max; QC 3.0 USB port
- Run times (10 cm, humidifier off): AirMini 38 hrs · DreamStation 2 40 hrs · DreamStation 1 39 hrs · AirSense 11 30 hrs · Luna G3 26 hrs · AirSense 10 24 hrs · Transcend Micro 51 hrs
- Warranty: 1 year
- In the box: battery, 24V adapter (AirSense 10/11, Luna G3), 12V adapter (DreamStation 1/2), charger
Best for: multi-night camping, RV and boat use, anyone who wants maximum hours and does not fly often.
Look elsewhere if: you fly regularly, or portability matters more to you than raw capacity.
#3 Portable Outlet X9 — $369
Why it ranks here
Prefer to watch? Jump straight to the Portable Outlet X9 in the video.
The X9 solves a different problem than the others. Instead of a DC adapter, it gives you a standard 110V wall outlet, so you plug in the same power supply that came with your CPAP. No matching adapters, no compatibility research, and it will still work if you switch machines in five years. It runs any CPAP, BiPAP, or home ventilator on the market.
Its real advantage is the UPS function. You leave it plugged in between your CPAP and the wall permanently. It keeps itself topped up while your therapy runs as normal, and if the power drops in the middle of the night it switches over instantly. You do not get up, you do not plug anything in, you do not wake up. For anyone living somewhere with hurricanes, ice storms, or rolling blackouts, that hands-off reliability is the whole point.
It also carries an IEC 60601-1-2 medical electromagnetic compatibility certification and uses pure sine wave AC output, the same clean waveform your wall outlet produces. It is backed by a $10,000 Safe CPAP Power Guarantee covering your device if the battery ever damages it.
The AC outlet also makes this the most generally useful of the four once you step away from CPAP. Anything that does not draw a large amount of power will run from it: a TV outside, lights around a campfire, a tailgate setup. It charges from a standard pigtail AC cord, the common kind that is easy to replace if it goes missing, and we sell spares for around $10.
Why not higher on the list? Size and efficiency. At 3 lbs and 6″ × 9.25″ × 1.5″ it is the largest item here, and the AC conversion costs you run time. Despite holding 159Wh, essentially the same as the Freedom 160, it delivers 10–12 hours on a home CPAP where the Freedom claims 24. That is the price of the wall-outlet convenience. It is also a 159Wh battery, so flying with it means calling the airline first.
Specifications
- Capacity: 159Wh / 14.4Ah
- Dimensions: 6″ × 9.25″ × 1.5″
- Weight: 3.0 lbs
- AC output: 110V / 60Hz, pure sine wave
- Run time: 10–12 hrs on home CPAPs, 16+ hrs on travel CPAPs
- Recharge: ~5 hrs wall (100V–240V) · 4–5 hrs solar · 5–6 hrs car
- USB: USB-A and USB-C, 5V–12V, 3.0A–3.6A shared
- Certifications: IEC 60601-1-2, UL62133, UL62368
- Warranty: 1 year limited
- In the box: battery, universal AC cord, travel bag
Best for: storm-prone areas, anyone who wants set-and-forget outage protection, BiPAP and ventilator users, and people who do not want to think about adapters ever again.
Look elsewhere if: your priority is packing light or getting the most hours per charge.
#4 NiteOwl CPAP Battery — $349
Why it ranks here
Prefer to watch? Jump straight to the NiteOwl in the video.
The NiteOwl is built differently from the other three. Rather than one sealed unit, it uses a removable cell pack that slides on and snaps into place. Buy a second cell and you can charge one while you run the other, then swap them over when the first runs down. For a long trip away from reliable power, that is a genuinely different way to solve the problem than carrying one larger battery.
The second clever thing is how it charges. Its DC input takes the same power supply your CPAP already uses. For an AirSense 10 or a Luna G3, you unplug the machine, plug that cord into the NiteOwl, and run the DC output cable across to your CPAP. No separate charging brick to pack, no proprietary cable to lose. An AirSense 11 cord needs the included adapter to fit, but the principle holds. When you are packing for a trip, leaving a power brick at home is worth more than it sounds.
Beyond that it runs 1–3 nights depending on your settings, works in line as backup so therapy continues through an outage, and includes a Quick Charge 3.0 USB outlet for your phone. It recharges in about three hours, the fastest of the four, and the cells are rated for 500 charge cycles. It also arrives with adapters for the AirSense 10, AirSense 11 and AirMini, the DreamStation 1 and 2, and the System One 60 Series.
It ranks fourth on the details rather than on capacity, where at 150Wh it is close to both batteries above it. Swapping cells is an extra step: when one runs down you separate the pack, fit the fresh cell and snap it back on. That is a small thing at home and a slightly bigger one at 3am in a tent. The Freedom 160 bridges two batteries into one continuous supply instead, so a second battery extends your run time with no intervention at all. For a dollar more the Freedom also gives you slightly more capacity, and for $20 more the Portable Outlet X9 adds medical certification, a universal AC outlet and a true UPS mode. The NiteOwl is also the longest battery here at 8.7″, and it has one USB port where the Universal has three.
Specifications
- Capacity: 150Wh, rechargeable lithium-ion
- Dimensions: 8.7″ L × 4.8″ W × 0.9″ H
- Weight: 1.7 lbs
- Rated input: 10V–28V
- Rated output: 12V–24V DC, depending on the DC output cable used
- Recharge time: 3 hours
- Cycle life: 500 cycles
- Run time: 1–3 nights depending on settings; up to 6 nights with a second cell pack
- Cell system: removable cell packs, swappable without powering down your setup
- Compatible machines: AirSense 10, AirSense 11, AirMini, DreamStation 1, DreamStation 2, System One 60 Series
- Air travel: permitted in carry-on, but at 150Wh you must arrange approval with your airline first
- Recharging: DC in, using your existing CPAP power supply. No USB input.
- Extras: Quick Charge 3.0 USB outlet, in-line backup power operation
- Warranty: 1 year
- Second cell pack: +$270
Best for: long trips where you would rather swap a fresh cell than wait on a recharge, and anyone who wants to pack one less power brick.
Look elsewhere if: you want the most capacity per dollar, or you would rather two batteries ran together automatically than swap cells by hand.
Which one is right for you?
- You fly several times a year. The Universal 20000mAh. Under 100Wh means no airline approval, and it disappears into a carry-on.
- You own an AirMini or Luna TravelPAP. The Universal 20000mAh. It gets 2–3 nights on those machines and matches their travel-sized footprint.
- You want one device for the CPAP, the laptop and the phones. The Universal 20000mAh, with 100W USB-C Power Delivery and two USB-A ports.
- Power outages are your main concern and you never want to think about it. The Portable Outlet X9, wired in as a UPS.
- You camp for several nights with no power at all. The Freedom 160, or two of them bridged together.
- You want to swap in a fresh cell rather than wait on a recharge. The NiteOwl, which also spares you packing a separate charging brick.
- You want a battery that earns its keep away from the CPAP too. The Portable Outlet X9. Its AC outlet will run lights at a campsite or a TV at a tailgate.
- You want the most capable battery for the least money. The Universal 20000mAh, at $189.
If you want the short version: the Universal is the travel and off-grid pick, the Freedom 160 is the one for long-term backup power, the X9 is for anyone who wants a battery that does more than run a CPAP, and the NiteOwl is for swapping cells on a long trip. Clay's own pick, for a household with kids, devices and hurricane season, is the Universal.
If you are still unsure, tell us your machine model, your pressure setting, and whether you use a heated humidifier, and we will tell you exactly how many nights to expect from each option. Call us at 844-289-4789 or browse the full CPAP power options collection.
Frequently asked questions
How many nights will a CPAP battery actually last?
It depends on three things: your machine, your pressure setting, and whether your humidifier is running. Higher pressures draw more power, and heated humidification and heated tubing can consume more than the blower motor itself. As a rough guide, expect a 74Wh battery to cover one to two nights on a home CPAP with the humidifier off, and a 160Wh battery to cover two to three. Turn the humidifier off and you will comfortably beat those numbers.
Can I take a CPAP battery on a plane?
Yes, in your carry-on. Lithium batteries are never permitted in checked luggage. Batteries up to 100 watt-hours go in your carry-on with no advance approval. Between 101Wh and 160Wh you are limited to two and you must get your airline's approval before the flight. Anything above 160Wh is not allowed. Only the Universal 20000mAh, at 74Wh, falls in the no-approval category. The Freedom 160 (160Wh), the Portable Outlet X9 (159Wh) and the NiteOwl (150Wh) all sit in the 101–160Wh band, so call your airline before you travel.
Do I need a prescription to buy a CPAP battery?
No. CPAP machines and complete mask kits require a prescription, but accessories, replacement parts, and batteries do not. You can order any battery on this page today.
Should I use my humidifier on battery power?
We recommend turning it off, along with heated tubing. It is the single biggest drain on a battery and can cut your run time by more than half. A saline nasal spray before bed handles dryness well for a night or two. If you must run humidification, choose a battery with a larger capacity and plan for roughly half the advertised run time.
What is the difference between a DC adapter and an AC outlet battery?
A DC battery connects to your CPAP through an adapter matched to your machine, bypassing the power brick entirely. That is the most efficient method and gives the longest run times. An AC battery, like the Portable Outlet X9, gives you a standard wall socket so you plug in your machine's existing power supply. That is more convenient and works with any machine, but converting to AC wastes some energy, so run times are shorter for the same capacity.
Will a battery kick in automatically if the power goes out overnight?
The Portable Outlet X9 is designed for exactly this. Left connected between your CPAP and the wall, it switches to battery power the moment the outage starts, with no gap in therapy. The Freedom 160 and NiteOwl can also be connected in line as backup power. The Universal 20000mAh is a standalone battery, so you connect it when you need it.
How do I recharge each of these batteries?
This varies more than you would expect. The Universal 20000mAh is the only one with a USB input, so it recharges from an ordinary phone cable, and also from a wall adapter, a car socket or a solar panel. The Freedom 160 uses the AC supply included in the box, with an optional DC charger available for car and solar charging. The Portable Outlet X9 charges from a standard pigtail AC cord, a car charger or a solar panel. The NiteOwl charges through its DC input using your existing CPAP power supply, so there is no extra brick to pack. None of the three larger batteries can be recharged over USB.
How should I store a battery so it is ready when I need it?
Keep it somewhere cool and dry, and recharge it every three to four months even if you have not used it. Lithium batteries slowly self-discharge, and letting one sit empty for a long time shortens its life. Setting a recurring calendar reminder is the easiest way to make sure the battery is full on the night you finally need it.
Can I charge my phone and laptop from these too?
All four have at least one USB port for phones. The Universal 20000mAh goes furthest with a 100W USB-C Power Delivery port that will fast-charge a laptop, plus two USB-A ports. The Portable Outlet X9 offers USB-A and USB-C for phones and tablets. The Freedom 160 and NiteOwl each have a single Quick Charge 3.0 USB port.
Run times listed here come from manufacturer testing and will vary with your pressure setting, mask fit, humidifier use, and ambient temperature.
