Inogen One G3 vs Inogen One G4: Which Concentrator is Right for You?

Portable Oxygen Concentrators
Inogen One G3 vs Inogen One G4

For individuals in need of medical oxygen, everyday activities can be stressful. With the introduction of portable oxygen concentrators, patients who once relied solely on oxygen tanks can now use smaller, compact machines to provide supplemental oxygen anywhere. The Inogen One line of POCs is lightweight and small, easy to carry around while on-the-go. So, which would you pick: Inogen One G3 or Inogen One G4?

Here’s a closer look at the Inogen One G3 and the Inogen One G4 portable oxygen machines. 


There’s nothing as counterintuitive than a portable oxygen concentrator that weighs a ton. Inogen prioritized weight with this line of POCs. Both the Inogen One G3 and Inogen One G4 are lightweight, ranging from 2.8 to 5.8 lbs. Users should pick the unit that best fits their lifestyle needs. 

The Inogen One G3 is fairly light at 4.8 lbs with the 8-cell battery and only 5.8 lbs with the 16-cell battery. The Inogen One G4 weighs in at 2.8 lbs with the 8-cell battery and 3.3 lbs with the 16-cell battery.

Simply comparing weight, the Inogen One G4 is the winner. 

Inogen One G4 Portable Concentrator


Along with weight, a compact design is essential when traveling with your concentrator. You want a unit that is small enough to carry and easy to pack. It’s no surprise that the machine that weighed less is also the smaller-sized unit. 

The Inogen One G3 is a small 8.75” L x 3.0” W x 8.25” H with a single battery. The Inogen One G4 measures only 5.9″ L x 2.7″ W x 7.2″ H with a single battery. While the weight and size aren’t significantly different, the Inogen One G4 does lend itself more to those with an active lifestyle.

Battery Life for Inogen One G3 vs Inogen One G4 

Another key difference between the Inogen One G3 and Inogen One G4 machines is their batteries. Remember, how long your concentrator is capable of delivering oxygen is one of the biggest deciding factors when it comes to a portable unit. Battery life depends on pulse rate and the battery cell type, so consider both factors when deciding what fits your needs. Both the Inogen One G3 and the Inogen One G4 offer single and double battery options, and the double batteries typically offer twice the length of charge.

Inogen One G3 Battery Life8-Cell16-Cell
Pulse 14.5 hr9.5 hr
Pulse 24.0 hr8.5 hr
Pulse 33.0 hr6.0 hr
Pulse 42.0 hr4.0 hr
Pulse 51.7 hr3.3 hr
Inogen One G4 Battery Life8-Cell16-Cell
Pulse 12.6 hr5.0 hr
Pulse 22.2 hr4.5 hr
Pulse 31.3 hr2.5 hr

While the batteries on either Inogen One concentrators are interchangeable and rechargeable, calculate how often you are in places where connecting your battery to charge is difficult. Based strictly on battery life, the Inogen One G3 offers longer battery duration over more pulse settings and is likely the better choice if you take frequent road trips, enjoy camping, or require higher pulse settings. 

Inogen One G3 Portable Oxygen Concentrator

Inogen One G3 vs Inogen One G4: Design 

When comparing the Inogen One G3 vs Inogen One G4 portable oxygen concentrators, both were designed to be lightweight and easily fit into a bag to carry along for daily activities. Both are battery-powered and can also be charged via AC/DC power sources. 

User-friendly features for both units include quiet operation (under 39 dba for the Inogen One G3 and under 40 dba for the Inogen One G4), optimal oxygen delivery technology, and an LCD display with large buttons and easy-to-adjust settings.

Flow Setting

Flow settings are important as they may vary depending on prescription. Most patients fall between 2 liters per minute to as high as 10 liters per minute. The amount needed may vary depending on the time of day or the engaged activity. 

The Inogen One G3 offers flow settings between 1-5 liters per minute pulse dose while the Inogen One G4 only has three settings. For patients in need of higher levels of oxygen, the Inogen One G3 is the better choice. 


Both the Inogen One portable oxygen concentrators are comparable in price. Both the Inogen One G3 and Inogen One G4 are currently priced at $2295. Prices are subject to change and are often discounted with promotions and sales.

Side-by-Side: Inogen One G3 vs Inogen One G4 

Here’s a recap of the most important features of both units.

UnitInogen One G3 OCInogen One G4 OC
Lighter x
More Compact x
Higher LPMx 
Comparative Pricexx
More Pulse Settingsx 
Battery Lifex 

So, Which One is the Winner? Which Concentrator is Better for You?

Both the Inogen One portable oxygen concentrators are reliable and efficient supplemental oxygen sources and can easily be incorporated into your daily life. Whether you choose the Inogen One G4 because it is lighter and more compact or the Inogen One G3 for heavier oxygen output, additional pulse setting range, and longer battery life is a decision based on your individual lifestyle needs. Both the Inogen One models come with a generous warranty; 3-years for the Inogen One G4 and 5-years for the Inogen One G3. 

Our customer care team is here to answer any questions. Give us a call at 888.941.1688 and let us help you decide which unit is best for your needs.