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  • C-400 Battery Inputs C-400 Battery Inputs
  • S8 C-400 CPAP Battery Pack S8 C-400 CPAP Battery Pack

C-400 CPAP Battery Pack

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Quick Overview

The C-400 cpap battery has not been authorised or approved by ResMed as an accessory for the ResMed s8 series.

The C-400 can run a CPAP machine for up to 6 nights on a single charge. Most customers purchase the C-400 for camping. Being on 3kg it is still very portable and perfect for those trips when AC/DC power might not be accessible. The C-400 can also be charged via solar panel. One additional benefit is the addition of USB ports which can be used to charge electronic items such as mobile phones or camera batteries etc.


Ultra Powerful C-400 Lithium ion Battery Pack for use with ResMed S8 Series CPAP/BiLevel Machines



The C-400 cpap battery has not been authorised or approved by ResMed as an accessory for the ResMed s8 series.

C-400 CPAP Battery The 12V-C-400 CPAP battery is super powerful, it's the largest cell in our CPAP battery range! It can power an S8 CPAP for up to 6 days on a single charge. Compared to lead acid batteries it is very light weight and weighs in at  around 3kg. The C-400 has many features that make it the perfect travel companion for your ResMed S8 Machine. The batteries can also be recharged and discharged simultaneously. The batteries have circuit function protection to ensure the safety and stability from overchargin, overdischargin and heat. The C-400 can be charged via 12V without the use of an power inverter. AC/DC charge takes approx 6 hours


In the Box: C-400 Lithium Ion Battery, Travel Case, Power Cord (for Recharging

the Battery Pack),  DC Power Cord (for connecting the S8 CPAP Machine to the Battery Pack)



The  Series C-400 Travel CPAP/BiPAP Battery Pack is a brilliant power solution for people who need truly portable sleep therapy or a reliable power backup for use during unexpected power outages. Most customers buy this battery for camping applications or situations where there is no AC power to charge the battery. Because it lasts multiple nights on a single charge, it is perfect for these situations.

The C-400 Battery Pack provides a 5-6 nights therapy so you can take your CPAP/BiPAP on vacation or camping. 

At the heart of the Travel Battery Pack is an  ultra-powerful Lithium Ion battery like those found in many laptop computers. In addition each pack comes with a convenient Travel Bag and a Standard Power Cord for recharging from Australian Wall Sockets.

The C-400 Battery Pack's specially designed charger will effectively recharge the battery without overcharging it. To make things even easier the LED's on the battery will let you know when the battery is fully recharged.

Average Run Times
  • Run times will vary depending on the age of your machine as well as machine settings. Run times for most S8 machines average between 40-50 hours.

Battery Specifications

  • Size: 26 x 16.4 x 4.25 cm
  • Weight: 3000 grams
  • Type: Lithium Ion Battery
  • Warranty: 12-Month Manufacturer's Warranty
  • Life: Rated 500+ Cycles
  • 12V 4A, 11.1V/12A (Max 15A) and USB 5V/2A
  • Output Cable: DC Cable with communication chip

Recharger Specifications

  • Charging Time: 6-Hour average from fully drained
  • Charging Indicator: LED lights
  • Universal Power Supply: Input Range 100-240 V, 50-60 Hz



The  C-400 Travel CPAP/BiPAP Battery is equipped with a DC Cable . To power your ResMed S8 CPAP/APAP/BiPAP with the battery simply connect your machine to the C-400 CPAP battery using the included  DC cord. 



Th C-400 is not recommeded for use on aircraft. We suggest you purchase the C-100 or the C-150.


  • Using a heated humidifier with your battery pack is not advised. The battery pack will not function whilst the H4i™ Humidifier is attached to the S8™
  • When you receive your battery pack it may include some charge. For best performance it should be fully charged prior to first use.
  • Always use the power supply provided to recharge your battery pack. Using a non-approved recharger may damage your battery.


in the box


Q: Can the battery be charged from a ciagrette 12V socket like those in a car or caravan?

A: Yes, however you will need to purchase a DC charger which is not included in the package. The DC charger is an optional accessory and is $59. The package comes with included AC/DC charger only.

Q: Can i take the battery on an airplane?

A: No, the C-400 is normally over the limits that airlines have.

Q:  Do i need to purchase any additional cables to run my CPAP?

A: No. The package comes complete with a DC Cable to connect your CPAP Machine to the battery and also the AC/DC Charger to charge the battery from the wall. If you wish to charge your battery via a 12V DC socket you will need to purchase an additional DC Charger from our store.

Q: How long will the battery run my CPAP for?

A: The exact time will vary from one customer to another. The lower the CPAP pressure requirements the longer the CPAP battery will last on a single charge. You can be guaranteed to get over 4 days (24 hours) on single charge however we have had some customers get over 7 days!

Q: Can i use my humidifier?

A: No, the humidifier draws to much power and it will deplete the battery charge very quickly.

Q: How long is the warranty?

A: The warranty is 1 year. 

Q: How long does it take to be delivered?

A: Postage is normally between 3-5 business days. We use Australia Post EXPRESS parcels and we will provide you with a tracking number. If you require a battery urgently it is best to let us know so we can put a priority on your battery and get it out as fast as possible.

Q: Why should i buy the C-400 over the ResMed RPS2?

A: The RPS2 will only run your CPAP for 1 night on a single charge! The C-400 will run your CPAP between 4-7 nights on a single charge. It can also be charged via SOLAR and or 12V DC (not included).


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