Inogen One G4 Portable Oxygen Concentrator



Everything you want to know about this product in a short video

Inogen One G4 Portable Oxygen Concentrator

0 out of 5

$2,495.00 $2,295.00

  • Pulse Flow Settings 1-3
  • 2.8 Pounds
  • 7.2” H x 5.91” L x 2.68” W
  • Up to 4.5 Hours of Battery Life (Setting of 2)
  • Sound Level 40 dBA (Setting of 2)
  • 3 Year Warranty










Inogen is a company that leads the oxygen industry. They started off with one of the first FAA-approved portable oxygen concentrators and since then they have never looked back. They recently released the Inogen One G4 and it has quickly become one of the most popular units on the market. And just like the Inogen One G2 and the Inogen One G3, the Inogen One G4 is reliable and packed with user-friendly features.Whether you’re looking for a portable oxygen concentrator to make your everyday life easier or if you want something that will give you the freedom to travel anywhere you can dream of, the Inogen One G4 should be at the top of your list.

Extremely Light and Portable

Weighing in at 2.8 pounds… Yes, you read that right! At 2.8 pounds and standing 7.2” H x 5.91” L x 2.68” W the G4 is the smallest and lightest portable oxygen concentrator to offer pulse flow settings 1-3 and its battery life is surprising for how small this machine is.

Being less restrictive with its oxygen settings and by giving you up to 5 hours of battery life, the Inogen One G4 set the bar high for competitors to follow.

Because of its small size, the Inogen One G4 is perfect for any occasion. Its compressor is rated to last 20,000 hours so you can have peace of mind using it every day. It’s small enough to carry virtually anywhere without feeling like your arm is going to fall off. And traveling with oxygen has never been easier than it is with the G4.

With the padded shoulder strap, you will be comfortable carrying your Inogen One G4 to the doctors, through the airport, or at the store. And at 2.8 pounds, you will use very little energy to carry your oxygen with you!


2 Battery Options to Match Your Needs

Just like its predecessors, the Inogen One G4 offers 2 different battery options:

  • Single Battery
  • Double Battery

With the single battery, you can get up to 2.25 hours of use on a single charge on a setting of 2 and your Inogen One G4 will weigh just 2.8 pounds. This setup is perfect for making trips to the doctor’s office, running to the store, doing things around your house, and exercising.

The double battery, on the other hand, gets up to 4.5 hours of use on a single charge. Despite doubling your battery life your Inogen One G4 will weigh a mere 3.3 pounds with the double battery installed. This setup will give you the freedom and independence to travel, go to sporting events, or get dinner and see a movie.

Here is a chart with the full expected battery lifetimes for your Inogen One G4:


Flow Rate 4-Cell Battery 8-Cell Battery
1 Up to 2.7 Hours Up to 5.0 Hours
2 Up to 2.25 Hours Up to 4.5 Hours
3 Up to 1.33 Hours Up to 2.5 Hours

Approved for Nighttime Use

Even though the Inogen One G4 is a pulse flow portable oxygen concentrator it is still approved for nighttime use while you sleep because it is equipped with Intelligent Delivery Technology. Now, the G4 won’t work for everyone at night, but as long as you don’t require a CPAP or BiPAP machine to sleep it should work for you!

Inogen’s Intelligent Delivery Technology is more sensitive when detecting your breath and it is more efficient at delivering your oxygen to ensure minimal amounts of your oxygen get wasted.

Here’s how Inogen’s Intelligent Delivery Technology works:

  • To ensure a minimal amount of oxygen gets wasted, Intelligent Delivery Technology delivers your oxygen within the first 400 milliseconds after your G4 detects your breath. This almost guarantees that you are receiving the full bolus dose of oxygen.
  • When you sleep, your breathing rate slows. Intelligent Delivery Technology monitors your breath rate and it will increase or decrease the amount of oxygen in each bolus dose depending on your breath rate and the oxygen setting you are using. So, if you are breathing at a rate of 10 breaths per minute your Inogen One G4 will double the amount of oxygen per bolus dose compared to if you were breathing at a rate of 20 breaths per minute. This guarantees you are getting your required oxygen!
  • One of the major reasons why other pulse flow portable oxygen concentrators don’t work for nighttime oxygen while you sleep is that they only detect a breath when you inhale through your nose. This is nearly impossible to control while you’re sleeping. With the Inogen One G4 you won’t have to worry about that because it will even detect shallow mouth breaths while you sleep to deliver your oxygen.

If you aren’t sure if the Inogen One G4 will work for you at night, you can always speak with your doctor about it or get a sleep test to make sure before you try it yourself.

Easy to Operate

Just like the other Inogen concentrators, the Inogen One G4 is simple and easy to use. The control panel is equipped with a backlit LCD screen and large push buttons.

The backlit LCD screen is easy to read in direct sunlight or in the dark. It displays vital information like your flow rate, your remaining battery life, and it will notify you if anything is wrong with your concentrator. And the font is large and easy to read so you won’t have to squint to see what it says.

Operating your G4 is simple. The control panel only has 4 push buttons:

  • Power Button (standard power symbol)
  • Flow Rate Up Button (plus sign)
  • Flow Rate Down Button (minus sign)
  • Audible Alarm Button (bell)

Changing batteries on your G4 is quick and easy too! The G4 batteries are equipped with easy push-to-release tabs that allow you to change your battery in seconds. And you won’t have any difficulty getting your replacement battery installed. To make the process as easy as possible, Inogen engineered the battery slot to have a track that ensures your battery perfectly aligns with your concentrator.


3 Charging Options

Recharging your Inogen One G4 batteries is fast and convenient. You have a total of three different charging options to choose from:

  • AC Power Supply
  • DC Power Supply
  • External Battery Charger

The AC power supply is the most common charging option. It charges your batteries faster than the DC power supply and you can use your Inogen One G4 on all 3 oxygen settings while you recharge. The AC power supply is equipped with a 110v power cord allowing you to plug it into any wall outlet. You can use it at home, in your hotel room, on a cruise ship and even some of the newer airplanes have 110v outlets at every seat.

While your Inogen One G4 is plugged into the AC power supply you will have an unlimited amount of oxygen. So, make sure you plug your G4 into the AC power supply if you plan on using it to sleep.

The DC power supply gives you the ability to power your concentrator and recharge your batteries on the go! It is equipped with a 12v power cord so you can plug it into the cigarette lighter or 12v outlet in your vehicle. You can take it in your car, truck, RV, or on your boat!

While your Inogen One G4 is plugged into the DC power supply it will recharge and supply you with oxygen on all 3 settings. However, if you are using your G4 while it is plugged into the DC power supply it will take longer to recharge. Remember to turn your vehicle on before plugging your G4 into the DC power supply otherwise, you might blow a fuse or drain your vehicle’s battery.

Although the external battery charger is an optional accessory, it is the most convenient charging option available for your Inogen One G4. It’s a single bay charger that gives you the ability to recharge your extra batteries without plugging your concentrator into a power supply. This means you can run errands, exercise, or go visit your friends and come home to a fully charged battery waiting for you!

Expected Recharge Time


  • Single Battery- Up to 3 Hours


  • Double Battery- Up to 5 Hours





What Comes With Your Inogen One G4:


  • Inogen One G4 Portable Oxygen Concentrator


  • Single Battery


  • AC Power Supply


  • DC Power Supply


  • Custom Carrying Case


  • Shoulder Strap


  • Tubing


  • Filter


  • Manual


  • 3 Year Warranty


Inogen One G4 Accessories:


  • Single Battery


  • Double Battery


  • AC Power Supply


  • DC Power Supply


  • External Battery Charger


  • Custom Carrying Case


  • Shoulder Strap


  • Particle Filter


Inogen One G4 Specs:

Weight Single Battery: 2.8 Pounds

Double Battery: 3.3 Pounds

Dimensions 7.2” H x 2.68” W x 5.91” L
Flow Rate Pulse Flow Settings 1-3
Battery Life Single Battery: Up to 2.25 Hours

Double Battery: Up to 4.5 Hours

Power 100-240 VAC, 50/60 Hz; 11-16 VDC
FAA Approved Yes
Warranty 3 Years


There are no reviews yet.

Be the first to review “Inogen One G4 Portable Oxygen Concentrator”