Why you need a CPAP battery backup
If you rely on a CPAP machine to treat sleep apnea, you already know what happens when the power goes out: your therapy stops, you wake up gasping, and the next day is a write-off. Power outages, camping trips, and long-haul flights all share the same problem. Without backup power, your CPAP is just a paperweight.
A CPAP battery backup solves that problem. It stores enough energy to run your machine through one or more nights, keeping your airway open whether you're weathering a storm at home or sleeping under the stars at a remote campsite.
The stakes are higher than simple inconvenience. Untreated sleep apnea raises the risk of high blood pressure, heart disease, and daytime drowsiness that can make driving dangerous. A reliable backup battery isn't a luxury. It's a safety net.
In 2026, you've got more options than ever, from lightweight, purpose-built CPAP packs that slip into a carry-on to full-size portable power stations that can run your humidifier, phone charger, and reading light all night. This guide breaks down the best choices in each category, compares them side by side, and helps you pick the right one for your specific setup.
What to look for in a CPAP battery backup
Before you spend a dollar, nail down four things:
1. Your CPAP's power draw
Check the wattage label on your power supply. Most CPAP machines draw between 15 and 30 watts without humidification, and 40 to 80 watts with a heated humidifier and heated tube running. That number determines how big a battery you need. Our CPAP battery sizing guide walks you through the exact math, including real-world measurements for popular machines like the ResMed AirSense 11 and DreamStation 2.
2. How many hours (or nights) you need
One night of CPAP therapy typically runs 7 to 9 hours. If you're planning a weekend camping trip, double that. For extended power outages (think hurricane season), you might want 3 or more nights of backup. Multiply your wattage by hours to get the watt-hours you need. For example, a CPAP drawing 25 W for 8 hours needs 200 Wh of battery capacity.
3. Travel requirements and FAA rules
If you fly with your CPAP, the FAA limits lithium-ion batteries to 100 Wh in carry-on luggage without prior approval. Batteries between 100 and 160 Wh require airline approval before you board. Anything over 160 Wh can't fly at all. See our CPAP travel checklist for FAA rules, airline-specific policies, and packing tips.
4. AC vs. DC connection
This one catches a lot of people off guard. When a battery powers your CPAP through an AC outlet, it converts stored DC energy to AC, then your CPAP's power brick converts it back to DC. That double conversion wastes 10% to 20% of your battery's capacity as heat. Purpose-built CPAP batteries connect via DC cable, skipping the conversion entirely. The result is more runtime from the same battery size. Check our CPAP battery compatibility guide to see which batteries support direct DC connections for your machine.
Best dedicated CPAP batteries
Dedicated CPAP batteries are designed specifically for sleep therapy machines. They're lighter, more efficient (thanks to direct DC output), and usually FAA-approved for air travel. The trade-off? They can only power your CPAP, not other devices.
Medistrom Pilot-24 Lite
The Medistrom Pilot-24 Lite is the gold standard for CPAP travel batteries. At 97 Wh, it slides comfortably under the FAA's 100 Wh limit. The direct DC connection to ResMed AirSense 10, AirMini, and other compatible machines eliminates inverter losses, squeezing every available watt-hour into actual therapy time.
In real-world testing, the Pilot-24 Lite powers a ResMed AirMini for roughly 13 hours without humidification. That's almost two full nights for most sleepers. It weighs just 1.4 pounds, making it one of the lightest options on the market.
The built-in smart display shows remaining capacity in both percentage and estimated hours, so you're never guessing how much runtime you've got left. It also supports solar charging through an optional adapter, which is handy for extended off-grid trips.
Pros: FAA-approved, lightweight (1.4 lb), silent operation, purpose-built DC output, solar charging compatible Cons: Only works with compatible CPAP models, won't power a humidifier all night, higher price per watt-hour than power stations Best for: Air travel and weekend trips Price: Around $290 Check price on Amazon
Freedom V2 CPAP Battery
The Freedom V2 is another purpose-built CPAP battery with broad compatibility across brands. It ships with multiple DC cables for ResMed and Philips machines, so you don't need to buy adapters separately. At 97 Wh, it's also FAA-approved.
Runtime is comparable to the Pilot-24 Lite: roughly 8 to 12 hours depending on your machine and pressure settings. It's slightly heavier at 1.6 pounds but often comes in at a lower price point, making it a solid value pick for frequent travelers who don't want to spend top dollar.
The Freedom V2 also works as a USB power bank, so you can charge your phone or tablet while your CPAP runs. That dual-purpose design adds versatility without adding much weight.
Pros: Multi-brand compatibility out of the box, solid build quality, under 100 Wh for FAA, USB charging port Cons: Slightly bulkier than Pilot-24 Lite, limited retail availability Best for: Users who switch between CPAP brands or want a versatile DC battery Price: Around $230 Check price on Amazon
ResMed Power Station II
The ResMed Power Station II is ResMed's own battery solution, designed to work seamlessly with AirSense 10 and AirSense 11 machines. At 97 Wh, it's FAA-compliant and connects via a proprietary DC cable that eliminates any compatibility guesswork.
Because it's made by ResMed, integration is flawless. The battery status appears directly on your AirSense 11's screen, and the connection is plug-and-play. Runtime sits around 8 to 13 hours depending on pressure settings and whether you're using EPR.
The downside is the premium price. You're paying for brand-name peace of mind and seamless integration, not extra capacity. If you use a ResMed machine exclusively and want the simplest possible setup, this is it.
Pros: Seamless ResMed integration, plug-and-play, FAA-approved, battery status on machine display Cons: Only works with ResMed machines, premium pricing, 97 Wh limits multi-night use Best for: ResMed users who want zero-hassle compatibility Price: Around $310 Check price on Amazon
Best portable power stations for CPAP
Portable power stations aren't designed specifically for CPAP, but they bring more capacity and versatility. You can power your CPAP through the AC outlet, charge your phone, and even run a small fan or light. The trade-off is more weight and some energy lost to AC conversion.
EcoFlow RIVER 2
The EcoFlow RIVER 2 packs 256 Wh into a 7.7-pound package, making it one of the most capable compact power stations available. The headline feature is fast charging: 0 to 100% in just 60 minutes from a wall outlet. If you forget to charge the night before a trip, you can top it off while you pack.
LiFePO4 battery chemistry means 3,000+ charge cycles before capacity drops to 80%. That's roughly 8 years of daily use. For CPAP backup, the RIVER 2 delivers approximately 8 to 10 hours of runtime at 25 W draw (no humidifier) or about 4 to 5 hours with a heated humidifier pulling 50 W.
The pure sine wave inverter handles any CPAP machine cleanly, and the built-in app lets you monitor power draw and remaining runtime from your phone. It's also solar-compatible, accepting up to 110 W from a portable panel.
Pros: Fast 60-minute charging, LiFePO4 longevity (3,000+ cycles), compact for 256 Wh, app monitoring, solar input Cons: Heavier than dedicated CPAP batteries, fan noise under load (though quiet at CPAP-level draws), too large for FAA carry-on Best for: Camping, home power outage backup, multi-device charging Price: Around $200 Check price on Amazon
Jackery Explorer 300
The Jackery Explorer 300 offers 293 Wh in Jackery's signature orange-and-black design at 7.1 pounds. It's a step up from the popular Explorer 240 v2, adding a bit more capacity and a cleaner power output.
For CPAP use, expect roughly 9 to 12 hours of runtime without humidification (at 25 W) or 5 to 6 hours with a heated humidifier. The Explorer 300 charges in about 2.5 hours from a wall outlet, which isn't as fast as the EcoFlow but perfectly adequate for overnight prep.
Jackery's build quality is well-proven across millions of units sold, and the simple LCD display makes it easy to see wattage draw and remaining percentage at a glance. Two USB-A ports and one USB-C port let you charge your phone and tablet alongside your CPAP.
Pros: Reliable brand, solid 293 Wh capacity, lightweight for a power station, dual USB output Cons: Li-ion chemistry (fewer charge cycles than LiFePO4), no app connectivity Best for: Budget-friendly one-night CPAP backup with extra capacity for devices Price: Around $250 Check price on Amazon
Jackery Explorer 240 v2
The Jackery Explorer 240 v2 remains one of the most popular entry points for CPAP backup power. At 241 Wh and 5.2 pounds, it hits a sweet spot between capacity and portability. The clean sine wave output handles any CPAP without issues.
Runtime lands at roughly 8 to 10 hours without humidification. That's enough for one solid night of therapy for most users. If you're on a budget and just need reliable one-night coverage, this is hard to beat.
Pros: Affordable, lightweight for capacity, reliable brand, clean sine wave Cons: Slower charging than EcoFlow, no LiFePO4, fewer charge cycles Best for: Budget-conscious buyers who want reliable one-night backup Price: Around $200 Check price on Amazon
Goal Zero Yeti 200X
The Goal Zero Yeti 200X brings 187 Wh in a compact 5-pound package. Goal Zero is well-known in the outdoor and overlanding community, and the Yeti 200X is one of their most travel-friendly models.
For CPAP backup, you'll get around 6 to 8 hours without humidification. That's cutting it close for a full night, so it's best suited for users with lower pressure settings or shorter sleep windows. The Yeti 200X really shines as part of a solar setup, pairing beautifully with Goal Zero's Nomad panels for extended off-grid trips.
Pros: Compact and lightweight, excellent solar ecosystem, trusted outdoor brand, USB-C PD output Cons: Smaller capacity limits single-night runtime, higher price per Wh Best for: Overlanding and solar-powered camping setups Price: Around $250 Check price on Amazon
Bluetti AC2A
The Bluetti AC2A packs 204 Wh of LiFePO4 capacity at an aggressive price point. The standout feature for CPAP users is UPS mode: plug your CPAP into the AC2A, plug the AC2A into the wall, and it automatically switches to battery power if your electricity fails. The switchover happens in under 20 milliseconds, fast enough that your CPAP won't skip a beat.
LiFePO4 chemistry gives you 3,000+ charge cycles, and the quiet operation means you won't hear a fan drone while you sleep. Runtime sits around 7 to 9 hours without humidification.
Pros: LiFePO4 durability, UPS mode for automatic failover, great price, quiet Cons: Smallest capacity in the power station group (204 Wh) Best for: Home UPS backup for CPAP, plugs in and auto-switches on power failure Price: Around $150 Check price on Amazon
NiteOwl CPAP Battery Backup
The NiteOwl is a dedicated CPAP battery backup power supply designed for bedside use. It connects directly to your CPAP via DC, eliminating inverter losses. A solid option for users who want a purpose-built solution without the bulk of a full power station.
Best for: Users who want a dedicated CPAP-only battery with simple DC connection
Bluetti X30 CPAP Battery (297Wh)
Bluetti's dedicated CPAP battery packs 297Wh into a purpose-built form factor with DC output cables for ResMed and Philips machines. It skips the inverter entirely for better efficiency than the AC2A, while offering nearly 50% more capacity. LiFePO4 chemistry provides long cycle life.
Best for: Users who want Bluetti quality in a CPAP-specific battery with strong capacity
Comparison table
| Product | Capacity (Wh) | Weight | Est. Runtime (no humidifier) | Est. Runtime (with humidifier) | Price | Link |
|---|---|---|---|---|---|---|
| Medistrom Pilot-24 Lite | 97 | 1.4 lb | 8–13 hrs | 3–4 hrs | ~$290 | Amazon |
| Freedom V2 | 97 | 1.6 lb | 8–12 hrs | 3–4 hrs | ~$230 | Amazon |
| ResMed Power Station II | 97 | 1.5 lb | 8–13 hrs | 3–4 hrs | ~$310 | Amazon |
| Goal Zero Yeti 200X | 187 | 5.0 lb | 6–8 hrs | 3–4 hrs | ~$250 | Amazon |
| Bluetti AC2A | 204 | 7.5 lb | 7–9 hrs | 3–5 hrs | ~$150 | Amazon |
| Jackery Explorer 240 v2 | 241 | 5.2 lb | 8–10 hrs | 4–5 hrs | ~$200 | Amazon |
| EcoFlow RIVER 2 | 256 | 7.7 lb | 8–10 hrs | 4–5 hrs | ~$200 | Amazon |
| Jackery Explorer 300 | 293 | 7.1 lb | 9–12 hrs | 5–6 hrs | ~$250 | Amazon |
Runtime estimates assume 25 W draw without humidifier and 50 W draw with heated humidifier. Dedicated batteries (Pilot-24, Freedom V2, ResMed) use DC-direct connection, which is 10–20% more efficient than AC. Your actual runtime depends on pressure settings, leak rate, and altitude.
How to choose the right CPAP battery backup
Picking the right battery comes down to how you plan to use it. Here's a quick decision framework:
- Flying regularly? Get the Medistrom Pilot-24 Lite or Freedom V2. They're FAA-approved, weigh under 2 pounds, and connect via DC for maximum efficiency. If you use a ResMed machine exclusively, the ResMed Power Station II offers the simplest plug-and-play experience.
- Camping or overlanding? The EcoFlow RIVER 2 or Jackery Explorer 300 balances capacity, weight, and price. Both can charge from solar panels for indefinite off-grid use. Read our CPAP camping setup guide for the full gear list, or our CPAP backpacking guide if you're hiking into the backcountry and need the lightest possible setup.
- Power outage protection at home? The Bluetti AC2A in UPS mode is the smartest choice. It sits plugged into your wall, charges automatically, and switches to battery power the instant the electricity fails. For extended outages lasting multiple days, step up to a larger unit like the EcoFlow DELTA 2. Learn more in our CPAP power outage guide.
- Multi-night off-grid? Pair a 500+ Wh station with a portable solar panel for indefinite runtime. The Jackery Explorer 500 or EcoFlow DELTA 2 are strong choices here.
- Using a heated humidifier? You'll need roughly double the capacity compared to CPAP-only use. A 256 Wh power station that lasts 10 hours without humidification might only give you 4 to 5 hours with it. Read our guide on CPAP humidifier battery drain for tips on extending runtime while keeping moisture levels comfortable.
Not sure which batteries are compatible with your CPAP machine? Check our CPAP battery compatibility guide for a complete breakdown by brand and model.
Understanding battery chemistry: Li-ion vs. LiFePO4
You'll see two battery chemistries across these picks, and the difference matters for long-term value.
Lithium-ion (Li-ion) is the standard chemistry in most consumer electronics. It offers good energy density (more Wh per pound) but typically lasts 500 to 1,000 charge cycles before capacity degrades noticeably. The Medistrom Pilot-24 Lite, Freedom V2, and Jackery Explorer 240 v2 all use Li-ion cells.
Lithium iron phosphate (LiFePO4) trades a bit of energy density for dramatically longer lifespan: 3,000+ cycles. That means a LiFePO4 battery used every night would last over 8 years before hitting 80% capacity. The EcoFlow RIVER 2 and Bluetti AC2A both use LiFePO4. If you're buying a battery for daily home backup use, LiFePO4 is worth the investment.
Tips for maximizing CPAP battery runtime
No matter which battery you choose, these tips help you squeeze out more hours:
- Turn off the heated humidifier. This is the single biggest power drain. Switching to a heat moisture exchanger (HME) filter can cut your power draw in half. Our CPAP humidifier battery drain guide covers this in detail.
- Use a DC-direct connection when possible. Skipping the AC inverter saves 10 to 20% of your battery's energy.
- Lower your pressure if clinically safe. Higher pressures require more motor effort. Talk to your sleep doctor before making changes.
- Keep the battery warm. Lithium batteries lose capacity in cold temperatures. In winter camping, keep the battery inside your sleeping bag until bedtime.
- Charge fully before each use. Partial charges don't hurt lithium batteries, but starting at 100% gives you the most runway.
- Address mask leaks. A leaky mask forces the CPAP motor to ramp up to maintain pressure, drawing more power. A well-fitted mask saves battery.
FAQ
How long does a CPAP battery backup last?
A typical CPAP battery backup lasts 1 to 3 nights depending on capacity and settings. A 240 Wh battery powers most CPAPs without humidification for about 8 to 12 hours. With a heated humidifier, expect roughly half that runtime.
Can I use any portable battery with my CPAP?
Not all batteries work with every CPAP. You need a pure sine wave inverter (for AC-powered machines) or a matching DC cable for direct connection. Modified sine wave inverters can damage your CPAP or trigger error codes. Always verify compatibility before buying.
What size battery backup do I need for CPAP?
For one night without humidification, 150 to 250 Wh is sufficient. With a heated humidifier, you'll need 300 Wh or more. Multiply by the number of nights you need coverage. Our CPAP battery sizing guide has a calculator to help you find the exact number.
Do CPAP battery backups work with heated humidifier?
Yes, but humidifiers increase power draw by 2 to 4 times. A battery that lasts 2 nights without humidification may only last one night with it running. Consider lowering the humidity setting or switching to an HME filter to extend runtime significantly.
Get the printable planner
All of this research in one printable PDF, including battery comparison tables, a runtime calculator, packing checklists, and a troubleshooting guide. Get the CPAP Travel Battery Kit Planner ($7.99)
Related guides
- CPAP Battery Sizing Guide: calculate exactly how many watt-hours you need
- CPAP Battery Compatibility Guide: which batteries work with your CPAP machine
- CPAP Humidifier Battery Drain: how humidification affects runtime and how to optimize it
- CPAP Travel Checklist: FAA rules, packing tips, and airline policies
- CPAP Camping Setup: off-grid gear list and solar charging tips
- CPAP Power Outage Guide: UPS setups and automatic failover
- CPAP Batteries 101: everything you need to know about CPAP backup power
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