Written and maintained by CASRAI Editorial Board
Last updated
This page describes products and general use; it is not medical advice.
A CPAP battery is a rechargeable power source that runs a CPAP (continuous positive airway pressure) machine when mains power is not available. Which one a person needs depends on the machine and on how long it must run, and the limits for carrying one on an aircraft depend on its watt-hour (Wh) rating. This page covers the battery side of a CPAP machine: what it is, how to read its rating, what changes runtime, and the published airline limits.
Who uses it: people who use CPAP therapy and need it away from a wall outlet, and the clinic staff, buyers and students who handle those devices.
What a CPAP battery is
CPAP machines normally run from a mains adapter. A battery replaces that supply for a period of time. Some portable CPAP models are designed with a battery option; Philips, for example, publishes run-time information for its DreamStation Go models (HH1448/00, HH1449/00 and HH1450/00). A battery is a power accessory, not a therapy component: it does not change the prescribed pressure, which is set on the machine. For the machine itself, mask and tubing, see what a CPAP machine is and CPAP and oxygen mask types.
How long does a CPAP battery last?
It depends on the therapy pressure, so a single hours figure is only meaningful with its test conditions. Philips states for the DreamStation Go: “Depending on your therapy pressure, you will likely get 1 to 2 nights of use on one charge.” At 10 cm H2O, Philips gives a run time of 13 hours, and says a fully depleted battery has a recharge time under 5 hours.
Philips lists the test conditions behind the 13-hour figure: CPAP mode, pressure 10 cm H2O, 12 mm tubing, 37 L/min of leak, a 73.4 F room at an elevation of 1650 ft (Philips support FAQ, checked 2026-10-30). A different pressure, tubing, leak rate or temperature will give a different result, and these numbers apply to Philips’s models, not to other brands.
Reading a watt-hour (Wh) rating
Watt-hours measure how much energy a battery stores. The FAA notes that newer lithium-ion batteries have the Wh rating marked on them, and that to calculate Wh you multiply the battery voltage by its amp-hours (Ah); for example, 12 V x 8 Ah = 96 Wh. The Wh figure, rather than the amp-hour figure alone, is what the FAA limits use.
Carrying a CPAP battery on an aircraft
The FAA’s PackSafe guidance for passengers sets limits by watt-hour rating for lithium-ion batteries (FAA PackSafe, checked 2026-10-30). The FAA notes that many airlines may have stricter quantity and Wh limits, so check with the airline before travelling.
| Battery rating | FAA passenger rule | Source |
|---|---|---|
| Up to 100 Wh | Within the FAA size limit for lithium-ion batteries carried by passengers | FAA PackSafe |
| 101 to 160 Wh | Spare batteries need airline approval; no more than two spares per person | FAA PackSafe |
| Spare (uninstalled) lithium batteries and power banks | Carry-on baggage only, with terminals protected from short circuit | FAA PackSafe |
TSA’s page on nebulizers, CPAPs, BiPAPs and APAPs states that these devices, facemasks and tubing may remain in their carrying case for X-ray screening but may need to be removed from the carry-on, and that devices containing lithium metal or lithium-ion batteries should be carried in carry-on baggage (TSA, checked 2026-10-30). The TSA officer makes the final decision at the checkpoint.
Built-in, external and mains power
A battery is one of several ways a CPAP machine is powered, alongside the mains adapter. The practical difference for buyers and staff is in the rating and the labelling: the Wh rating (or volts and amp-hours) must be readable on the battery to apply the airline tiers above, and the manufacturer’s instructions for use state which battery or power accessory is intended for a given machine model.
Safe use and handling basics
- Use the power accessory the machine manufacturer specifies for that model, as stated in its instructions for use.
- Keep spare lithium batteries in carry-on baggage when flying, per FAA and TSA guidance above.
- Take any question about therapy settings or whether a battery suits a particular patient to the prescribing clinician; this page does not address individual care.
Common mistakes
- Comparing runtime claims without the pressure and conditions they were measured at.
- Reading amp-hours without volts, so the Wh tier is never calculated.
- Putting a spare lithium battery in checked baggage.
- Assuming one airline’s rule applies to all; the FAA says airlines may be stricter.
FAQ
How many hours does a CPAP battery run?
It varies with pressure. For the Philips DreamStation Go, Philips gives 13 hours at 10 cm H2O under its stated test conditions and 1 to 2 nights of use on a charge depending on pressure.
Can I take a CPAP battery on a plane?
Under FAA guidance, lithium-ion batteries are limited to 100 Wh each, with up to two larger spares (101 to 160 Wh) allowed with airline approval; spare batteries go in carry-on baggage only. Check the airline’s own rules.
What is the difference between a CPAP battery and a travel CPAP?
A battery is a power source. A travel CPAP is a compact machine, and some models offer a battery option. Travel advice itself is outside the scope of this page.
Sources
- Philips, DreamStation Go FAQ: how long does the battery last (checked 2026-10-30): https://www.usa.philips.com/c-f/XC000015475/how-long-does-the-battery-of-my-dreamstation-go-last
- TSA, Nebulizers, CPAPs, BiPAPs, and APAPs (checked 2026-10-30): https://www.tsa.gov/travel/security-screening/whatcanibring/items/nebulizers-cpaps-bipaps-and-apaps
- FAA PackSafe, Lithium Batteries (checked 2026-10-30): https://www.faa.gov/hazmat/packsafe/lithium-batteries
Related supplies: CPAP and oxygen masks. See also what an oxygen concentrator is.
