Both concentrators come with two battery options–a small (single) battery which keeps the unit lighter and a large (double) battery which doubles the battery time on most settings. The Inogen One G4’s single battery has 4 cells and the double battery has 8 cells, while the Inogen One G3’s single battery has 8 cells and the double battery has 16 cells. Because of the Inogen One G3’s larger batteries, it does provide about twice the battery time.
In addition to batteries, both concentrators come with an AC power adapter so that is can run continuously while plugged into a wall outlet. They also come with a DC power adapter which can be plugged into an auxiliary power outlet in a car. This is beneficial as it can run from the car battery, enabling you to have a full battery charge when you reach your destination.
Note: All battery times are manufacturer specifications and based on a low breath rate. Actual battery durations experienced by our customers is usually lower. For instance, the G3 16-cell battery typically lasts 8 hours (rather than 9).
The Inogen One G3 and G4 satisfy the FAA requirements for air travel. The small size and long battery time are ideal for air travel.
If increased oxygen output is required and longer battery times are desired then look toward the Inogen G3. With a weight of 4.8 lbs., the G3 is still one of the lighter concentrators available anywhere. Many oxygen therapy patients might require increased oxygen in the future. With 1 – 5 pulse flow settings many see increased value in the G3 as a better long-term solution. Also, the G3 provides about double the battery time as the G4, allowing for longer excursions and greater peace of mind while away from a power source.
If you are new to oxygen therapy and your oxygen requirements are minimal, or if size and weight are the most important due to factors such as shoulder and back issues, then the G4 is an ideal fit. It is not only smaller and lighter than the G3, but it also may be carried around one’s waist, thus alleviating back and shoulder pressure.
The Inogen One G3 and Inogen One G4 are two of the best POCs in their class and we are confident recommending each of these models if they meet your oxygen requirements.