Portable oxygen concentrators have transformed the lives of individuals with respiratory conditions, offering freedom and mobility without the burden of heavy oxygen tanks. With many models available, choosing the best portable oxygen concentrator can be challenging.

Two top contenders in this category are the Inogen One G4 and the Rhythm P2-S4. In this guide, we compare their features, differences, pros, and cons to help you determine which one best fits your needs.

What is the Best Portable Oxygen Concentrator?

A portable oxygen concentrator (POC) is a medical device that delivers oxygen therapy to patients with respiratory issues such as COPD, pulmonary fibrosis, and other lung diseases. Unlike traditional oxygen tanks, POCs are lightweight, battery-powered, and designed for mobility, making them an excellent choice for active users.

The best portable oxygen concentrator should be lightweight, have a long battery life, and offer the right oxygen flow levels for your needs. Let’s compare two popular models: Inogen One G4 vs. Rhythm P2-S4.

Comparison: Inogen One G4 vs. Rhythm P2-S4

Key Specifications

Feature	Inogen One G4	Rhythm P2-S4
Weight	2.8 lbs (1.27 kg)	4.37 lbs (1.98 kg)
Dimensions	5.91” x 2.68” x 7.2”	8.7” x 3.3” x 5.9”
Oxygen Flow	Pulse dose: Levels 1-3	Pulse dose: Levels 1-4
Battery Life	Up to 5 hours (double battery)	Up to 9 hours (extended battery)
Noise Level	~40 dB	~39 dB
FAA Approved?	✅ Yes	✅ Yes

Both models are FAA-approved, meaning they are safe for air travel. However, they differ in weight, battery life, and oxygen output.

Differences Between Inogen One G4 and Rhythm P2-S4

1 Size and Weight

Inogen One G4 is significantly smaller and lighter, making it a top choice for those prioritizing mobility.
Rhythm P2-S4 is larger and heavier, but still portable and comfortable for daily use.

2 Oxygen Flow

Rhythm P2-S4 provides up to level 4, which can be crucial for users needing higher oxygen support.
Inogen One G4 has a maximum of level 3, which is sufficient for many but may not meet the needs of those requiring higher oxygen levels.

3 Battery Life

Rhythm P2-S4 has a longer battery life (up to 9 hours with an extended battery), making it ideal for long outings or travel.
Inogen One G4 lasts up to 5 hours with a double battery, so extra batteries or recharging may be necessary for extended use.

4 Noise Level

Both models are quiet, operating at around 40 dB, making them discreet and suitable for use in quiet environments.

Pros and Cons of Each Model

✅ Pros of Inogen One G4

Extremely lightweight and compact, perfect for daily mobility.
Sleek and discreet design, easy to carry.
FAA-approved, making it an excellent choice for frequent travelers.

Cons of Inogen One G4

Shorter battery life compared to the Rhythm P2-S4.
Lower maximum oxygen flow (up to level 3), which may not be enough for some users.

✅ Pros of Rhythm P2-S4

Longer battery life (up to 9 hours with an extended battery).
Higher oxygen flow capability, reaching level 4.
Easy-to-use design with a user-friendly interface.

Cons of Rhythm P2-S4

Heavier and bulkier than the Inogen One G4.
Less well-known brand, compared to Inogen, a more established manufacturer.

How to Choose the Best Portable Oxygen Concentrator

The choice between the Inogen One G4 and the Rhythm P2-S4 depends on your specific needs:

Choose the Inogen One G4 if you want the lightest and most compact model for easy daily mobility.
Choose the Rhythm P2-S4 if you need longer battery life and a higher oxygen flow.

Both devices are excellent for travel and offer high-quality oxygen therapy. However, the best portable oxygen concentrator for you will depend on your lifestyle, oxygen needs, and preference for size versus battery life.

Where to Buy the Best Portable Oxygen Concentrator?

You can find both models and other high-quality oxygen therapy equipment at oxygen-equipment.com. We offer expert guidance and the best prices on oxygen concentrators.

Have questions? Contact us today, and we’ll help you choose the best portable oxygen concentrator for your needs!

Conclusion

When choosing the best portable oxygen concentrator, consider size, battery life, and oxygen flow levels.

✅ If you need a lightweight, ultra-portable option, the Inogen One G4 is the best choice.
✅ If you require a longer battery life and higher oxygen flow, the Rhythm P2-S4 is the better option.

Ready to buy? Get your portable oxygen concentrator here: