P2 vs Liberty 2 Portable Oxygen Concentrators – Which One Fits Your Lifestyle?
P2 vs Liberty 2 Portable Oxygen Concentrators – Which One Fits Your Lifestyle?
Searching for a reliable portable oxygen concentrator that fits your lifestyle? Whether you’re traveling, staying active during the day, or sleeping with oxygen at night, choosing the right unit matters. At Travel Oxygen by Liberty Medical, we offer two excellent FAA-approved options: the P2 by Rhythm Healthcare and the Liberty 2 by O2 Concepts.
Each machine has unique strengths. In this comparison, we’ll explore their differences in flow modes, battery life, weight, noise levels, and best-use scenarios to help you make the best choice.
Quick Comparison: Liberty 2 vs P2
| Feature | P2 | Liberty 2 |
|---|---|---|
| Flow Type | Pulse Only (up to 6 LPM) | Pulse (up to 10 LPM) + Continuous (up to 2 LPM) |
| Weight with Battery | 4.37 lbs | 7.5 lbs |
| FAA Approved | Yes | Yes |
| Battery Life (Pulse 2 LPM) | Up to 4 hours | 4 hrs 30 mins |
| Battery Life (Continuous 2 LPM) | Not supported | 1 hour |
| Charging Time | 4 hours | Under 2.5 hours |
| Noise Level | 49 dB (Quiet conversation) | 44.4–52.3 dB |
| Best For | Travel, day use, active lifestyles | Day + Night use, higher oxygen needs, pediatric & adult patients |
The P2 – Ultra-Light & Built for On-the-Go Oxygen
The P2 Portable Oxygen Concentrator is one of the lightest concentrators in its class, weighing just 4.37 lbs with the battery. It delivers oxygen using pulse flow settings from 1 to 6, making it ideal for active users who want maximum portability and simplicity.
This FAA-approved unit is whisper-quiet and comes with a complete travel kit including AC/DC power, a carry bag, and a nasal cannula. For users looking to fly, hike, or run errands without dragging a heavy machine, the P2 is a top choice.
Need more battery time? Add an extra P2 battery to your setup or browse all P2 accessories.
Key Specs for the P2:
- Weight: 4.37 lbs with battery
- Flow: Pulse only (up to 6 LPM)
- Battery life: Up to 5 hours (setting 1)
- Noise: 49 dB
- FAA Approved: Yes
- Charging time: 4 hours
The Liberty 2 – Versatile Oxygen for Day & Night
The Liberty 2 Portable Oxygen Concentrator by O2 Concepts is a dual-function machine, offering both pulse and continuous flow. This makes it ideal for users who need oxygen while sleeping, as well as those with high pulse flow needs during the day. It delivers up to 10 LPM in pulse mode and up to 2 LPM continuous.
Despite being powerful, the Liberty 2 remains FAA-approved and portable. It weighs 7.5 lbs with the battery and features smart DNA® technology for remote monitoring, software updates, and proactive support. It’s a smart, connected choice for those with complex oxygen needs, including pediatric patients.
Key Specs for the Liberty 2:
- Weight: 7.5 lbs with battery
- Flow: Pulse (up to 10 LPM), Continuous (up to 2 LPM)
- Battery life: Up to 4.5 hours (pulse), 1 hour (continuous at 2 LPM)
- Noise: 44.4–52.3 dB depending on setting
- FAA Approved: Yes
- Charging time: Under 2.5 hours
Which Portable Oxygen Concentrator is Right for You?
Choose the P2 if you:
- Want the lightest possible machine for travel and mobility
- Only use pulse flow oxygen (no need for continuous)
- Prefer a compact design with minimal noise
- Need an affordable, travel-ready concentrator
Choose the Liberty 2 if you:
- Require continuous flow oxygen for nighttime use
- Need higher pulse flow rates during the day (up to 10)
- Want advanced features like DNA® remote monitoring
- Need a pediatric-compatible, high-capacity machine
Still Deciding? Let Us Help!
Not sure which model is best for your oxygen needs? Contact our oxygen specialists at Travel Oxygen or call us at 800-375-6060 for expert recommendations and fast answers.
We also offer short-term oxygen concentrator rentals if you’re traveling or trying a new machine before buying.
Shop Smart. Travel Free. Breathe Easy.
Explore our full collection of portable oxygen concentrators for sale and oxygen accessories to complete your setup.
At Travel Oxygen, you get more than just equipment—you get expert support, fast shipping, and a family-owned company that’s been serving oxygen users for 30+ years.
Shop the P2: Click here
Shop the Liberty 2: Click here