Inogen One G4 Portable Oxygen Concentrator with SINGLE BATTERY

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-NA

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 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.