Inogen One G2 and One G3 Portable Oxygen Concentrator FAQs

When many people find out there are two of these Inogen One concentrators, they become a little confused. They also begin to wonder about the batteries that come along with them, the 12-cell and the 24-cell and 8 and 16-cell batteries. Then come the mentions of battery chargers, and then it becomes even more confusing. Here are some frequently asked questions and their answers to hopefully and quickly clear up any confusion about these two portable oxygen concentrators and their workings.

Which Inogen One portable concentrator should I choose? How do I know which one is right for me?

While both the Inogen One G2 and G3 are light, small and powerful, the G2 weighs more. With the 12-cell battery, the G2 weighs 7.25 pounds, while the G3 weighs 5 pounds with the battery 8-cell battery. If you require 5 Liters Per Minute (LPM) of a pulse dose, then the G2 is the one you would need to go with, if you are choosing between these two concentrators. If you only need between 1 and 4 LPM of pulse dose oxygen, you can go with the G3 and enjoy a lighter concentrator.

Which battery should I use, and what is the difference between them?

With the G3, you can choose the 8-cell or the 16-cell battery. For the G2, you have the option of the 12-cell and the 24-cell. The smaller the cell, the less power they can hold and the less time you have between charges or switching to a fully-charged batter. The 8-cell battery can last up to 4 hours with complete portability, and the 16-cell can hold a charge for up to 8 hours. The bigger the cell, the heavier the battery will be, so keep this in mind.

Generally, you should choose your battery size by how long you will need to be using your portable oxygen concentrator without interruption while you are out and about. If you require a pulse dose of 5 LPM for more than 8 hours out of the day and you want to take a trip where you are walking around a lot and you won't be around a power source, you will need to choose the G2 with the 24-cell battery.

What if I decide I need a larger battery size than what is included in the package?

The initial package we offer for the Inogen One G3 comes with the 8-cell battery, but you can upgrade to the 16-cell by request when you order your concentrator. The same goes with the G2 – our package offers the 12-cell battery, but you can make a request for the 24-cell battery if you need add portability time.

It's very important to carry a spare battery and a charger with you wherever you go, especially if you are traveling by plane. Most airlines require that you bring a fully-charged spare battery with you on your flight. It's a good idea anyone, just in case you get stranded somewhere, or if you're going to be away from a power source for a long time.

About Scott Ridl: Scott joined American Medical Sales and Rentals in 2008 as a Web Manager and Content Writer. He is a writer and designer. He is extensively trained on oxygen therapy products from leading manufacturers such as Inogen, Respironics, Chart, Invacare, ResMed and more. Scott works closely with respiratory therapists and oxygen specialists to educate the community about oxygen therapy products, COPD, asthma and lung diseases. He writes weekly columns and is passionate about educating the community on oxygen therapy and respiratory issues.

4 thoughts on “Inogen One G2 and One G3 Portable Oxygen Concentrator FAQs”

  • Daughter

    I am curious about these units, does anyone with end stage COPD have them? My dad is basically bed bound. When he does get up it's a huge hassle for him to turn on his portable tank and hauling it is becoming more and more of am issue. He won't leave the house because of its unwieldiness and rarely even sits outside or at the table. If this unit is right for someone whose o2 demands are high then it would be a good option for him. He has 15% of his lung function remaining and is on 3lit continuously but can be increased to 5lit during an exasperation.

    • scottamsr

      Many oxygen users have the
      portable oxygen machines from stage 1 COPD to end stage. If your father
      requires a 3-5 liter per minute continuous flow, the lightest weight portable I
      can offer you or anyone in the industry can offer you is 18 pounds. These
      machines come on a cart that you can wheel around behind you sort of like your
      luggage in the airport. Please let me know if this is something you are looking

  • Ardian

    Hi there! lm on 2.5-3 lt/min dayly. Wich machine is better for me? COPD stege 4. Thanl you.

    • Margaret Goodman
      Margaret Goodman January 2, 2019 at 3:43 am

      There are many things to consider when choosing the machine that is right for you. The setting that you need is that pulse dose or continuous flow, we would also consider the weight of the machine and what you would like to spend. To best serve you I have passed along your information to one of our oxygen specialists. If you prefer you may also give us a call at 888-360-9628.


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