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Inogen One G4 Portable Oxygen Concentrator with SINGLE BATTERY

Comfortable and Portable


Inogen One G4 Portable Oxygen Concentrator with SINGLE BATTERY

SKU: Inogen IS-400-NA
Condition: New
Shipping: Free Shipping


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ONLY 2.8 POUNDS! The Inogen One G4 system with the 4-Cell Single Battery provides pulse flow settings from 1-3, is 7.2″H x 5.91″L x 2.68″W in size and One 4-Cell Single Battery lasts up to 3 Hours. *INOGEN AUTHORIZED DEALER* Additional Packages Available…

INOGEN ONE G4 SYSTEM Inogen One G4 Model IS-400-3y4

System Includes:

  • Single Rechargeable Battery 
  • NEW G4 Concentrator
  • 3-year warranty
  • AC/DC power supplies
  • Carry bag, user manual
  • Meets FAA requirements
  • Intelligent Delivery Technology®
  • Bluetooth System
  • Inogen Connect App
  • Lifetime Support
  • Fed Ex FREE Shipping

Check out the Inogen One G4 with the longer lasting Double Size Battery.

Call 1-800-958-0192 or Request Using Form to View All SALE Packages! 

The Inogen One G4 portable oxygen concentrator with a single battery is the smallest portable oxygen concentrator available to portable oxygen users. 

The G4 system is recommended for use during the day and at night, making it a simple solution 24/7.

Inogen Freedom packages are available with either the 4-cell Single battery, the 8-cell Double battery, or you can mix & match battery sizes in a package suited to your lifestyle. Get Complete Details and Package Pricing!

Every package comes with both an AC wall adapter and a DC vehicle adapter and you can plug the G4 into any power source to recharge the battery. On a full charge, the 4-cell Single battery will last up to 2 hours at a setting of 2. We do offer discounted battery packages if having an extra battery run-time is preferred. We also have the G4 System Available with the longer lasting 8-Cell Double Battery (most popular battery).

The G4 portable oxygen concentrator is FAA Approved for use on board all major aircraft and is indicated on the label affixed to the bottom of the machine.


  • Setting 1 – Up to 3 Hours
  • Setting 2 – Up to 2 Hours
  • Setting 3 – Up to 1.25 Hours

Inogen One G4 Portable Oxygen Concentrator with 4-cell Single Battery Specifications: 

  • Weight – 2.8 Pounds
  • Dimensions – 7.2” H x 2.68” W x 5.91” L
  • Flow – Pulse 1-3
  • Power – 100-240 VAC, 50/60 Hz; 11-16 VDC
  • Warranty – 3 Yr Device; 1 Yr Columns/Accessories


Inogen G4 Portable Oxygen Concentrator Frequently Asked Questions

Q. Are you an Authorized Inogen G4 Dealer? Yes, we are an Authorized Inogen Discount Distributor.

Q. How small is the Inogen One G4 portable oxygen concentrator with the 4-Cell Single Battery? The G4 oxygen machine weighs only 2.8 pounds with the 4-Cell single battery and stands just 7.79” H x 2.68” W x 5.91” L. The G4 device is designed to be worn over your shoulder like a camera bag or a purse. There is an optional Hip Bag and Back Pack. Call for Details.

Q. What is packaged with this Inogen One G4 Single battery system? System Includes: G4 Concentrator unit, (1) 4-cell Battery, AC Power Supply, DC Power Cable, Carry Bag, User Manual, 3 Year Warranty.

Q. How much oxygen can the G4 oxygen concentrator produce? The Inogen One G4 offers pulse only settings of 1,2, and 3.

Q. What is the oxygen concentration of the Inogen One G4? The oxygen concentration of the G4 oxygen generator is 90% +/- 3% on all settings. The G4 is equipped with a “Low O2” internal Oxygen Sensor and will alarm should the O2 concentration go below therapeutic range.

Q. Does the Inogen One G4 have an internal battery? The Inogen One G4 POC does NOT have an internal battery. The unit runs off of an external battery cartridge which is easily inserted and disconnected with simple push button operation. Swapping out batteries is quick and simple.

Q. Is the G4 portable oxygen concentrator allowed on an airplane? Yes.The G4 oxygen machine is FAA approved. Note: Prior To Traveling by Plane: Check with your airline a few weeks in advance regarding their policies for use of Portable Oxygen Concentrators.

Q. Can I use the G4 while sleeping? The G4 oxygen concentrator comes equipped with Intelligent Delivery Technology. As your breathing rate slows down, the G4’s Intelligent Delivery Technology will increase the size of the oxygen bolus dose. During periods of sleep, the unit has a more sensitive breath detection trigger. This is important in order to detect a more shallow breath which is sometimes the case with some individuals and those of you that are mouth breathers. This allows most oxygen users to sleep with the Inogen One G4. The G4 is not recommended for use with a CPAP or BiPAP machine.


3 YEAR STANDARD WARRANTY; LIFETIME WARRANTY AVAILABLE. CALL 1-800-958-0192 FOR DETAILS, DEALS, AND CUSTOM QUOTES. **A valid prescription is required for the purchase of this product.






Small and Quiet
Posted by Allyssa on 26th July 2021

“This machine is so small and easy for me to carry. I take it everywhere. Certainly makes going places much less of a headache for me. I’m thankful I found your company and for all you help. Thanks!”


Great experience
Posted by Anna on 2nd Jan 2021

“Thank you for all your help in choosing a system for my dad. The G4 is working great and he is more active than I have seen him for a while now. My family is so happy with our purchase and for all your patience and guidance. Thank you!”


Very Satisfied
Posted by Michelle M on 21st May 2020

“I really am enjoying my new g4. It is definitely as tiny as you told me. I like having an oxygen supply that is finally lightweight enough for me to manage. I do like that I purchased two batteries and being able to plug in my car, too. I am very satisfied with my decision and thank you for all your help.”




Quality & Portability in One

We Work with and Supply a Number of Trusted Brands

We work with only the most trusted manufacturers and carry only oxygen machines that are known to perform well. Our lineup features top brands for our customers, including but not limited to Rhythm Healthcare, Belluscura, Inogen, O2 Concepts, Caire, and Philips Respironics.


8000 Corporate Center Drive
Suite 113
Charlotte, NC 28226

Business Hours

8:00am - 5:00pm EST

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