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Inogen One G4 Portable Oxygen Concentrator with SINGLE BATTERY

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  • Inogen One G4 Portable Oxygen Machine Lady Wearing in Park
  • Inogen One G4 Portable Oxygen Concentrator with 4-cell Single Battery
  • 4-Cell Single Battery for use with the INogen One G4 Portable Oxygen Concentrator
  • Inogen G4 with Single Battery Shown in Carry Case
  • G4 Portable Oxygen Machine Shown With Tubing
  • Inogen G4 shown beside an apple

 Product Description

Inogen One G4 Portable Oxygen Concentrator | Model IS-400-NA

Inogen One G4 With Woman In Grocery Store

The Inogen One G4 portable oxygen concentrator is the smallest portable oxygen concentrator available to portable oxygen users. 

The Inogen One G4 system with the 4-cell single battery weighs just 2.8 pounds and provides 1-3 pulse flow oxygen settings. The G4 portable oxygen generator 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. Call For 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).

Additional G4 Battery Configurations Available! Please give us a call at 1-800-958-0192 and we can help customize a G4 package that will work best for you.

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 and can be verified directly on the Inogen website.

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.



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 Product Reviews


    Posted by Judy G. on 31st Mar 2019

    I really like my new G4. It's very small and I can just pick it up and leave my home as I do my purse. very satisfied thus far.

  2. Excellent little machine

    Posted by Gerry S. on 28th Nov 2018

    Great system. Very lightweight and easy to carry. It’s so much easier for me whenever I have to leave my house. Great price and fantastic service.

  3. Great Little Machine

    Posted by Diane Martin on 9th Jun 2018

    Really appreciate the small size and light weight, had tried others without success. Getting use to using it so training myself to purse lip breathing rather than huffing thru my mouth when stressed. Customer Service has been great and staff was so patient with me, answering all my question quickly. It was a big decision but one I am glad I made.

  4. Fantastic!

    Posted by Mrs. Olivia on 25th Oct 2017

    Everyone needs to try this machine! I love, love it. I was so tired of lugging those heavy cylinders around everywhere I went. Those tanks are a huge nightmare! This little device has been wonderful. Kudos to Jeff and his staff for being so helpful and patient with me. I absolutely agree with all the other positive reviews from people. Such a nice company.

  5. inogeng4

    Posted by Unknown on 3rd Aug 2017

    I felt like I was chained to my house or had to lug tanks when going out. This little portable unit is amazing; it gave me freedom back.

  6. Amazingly tiny!

    Posted by Lois G. on 3rd Apr 2017

    Such a nicely designed portable oxygen machine. It's so small and easy for me to carry. I even wear it around my waist when I'm working outside or cleaning the house. It's been great!


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