Inogen One G4 Certified Pre‑Owned Portable Oxygen Concentrator

FAA‑approved portability with brand‑new critical components and a 1‑year U.S. warranty.

⭐ Why This Certified Pre-Owned G4 Is a Smart Buy

If you need reliable portable oxygen therapy but want to avoid the cost of a brand-new unit, the G4 Certified Pre-Owned offers the same clinical pulse-dose performance at a significantly lower price.

Each unit is professionally refurbished and restored to meet operational specifications. This is not a “used-as-is” device — it is carefully rebuilt with new critical components and performance verified by technicians.

Compact. Lightweight. Travel-ready.

This model is ideal for:

• Daily errands

• Travel

• Backup oxygen

• Active users requiring pulse-dose settings 1–3

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🛠️ What “Certified Pre-Owned” Means Here

Every unit undergoes:

• Installation of brand-new sieve beds

• New lithium battery (based on selected package)

• New external accessories

• Compressor replaced or tested to meet performance standards

• Functional verification within oxygen concentration specifications

You receive dependable therapy without paying full retail pricing.

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🔋 Variable Product – Choose Your Battery Option

You can select:

• Single Battery (4-cell)

Lightest configuration, ideal for short outings.

• Double Battery (8-cell)

Extended runtime for longer use and travel planning.

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🔋 Battery Runtime (Typical Estimates)

Runtime varies based on breathing pattern, altitude, temperature, and cannula length.

Pulse Dose – Single Battery (4-Cell)

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Pulse Dose – Double Battery (8-Cell)

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Travel Tip:
Many airlines require battery capacity equal to 150% of total flight time. Plan accordingly.

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⚡ Charging Time (Approximate)

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📐 Technical Specifications

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📦 What’s Included in the Box

• Certified Pre-Owned G4 unit

• New lithium battery (single or double based on selection)

• Carry bag with strap

• AC power supply

• DC vehicle cable

• User manual

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🛡️ 1-Year Warranty + U.S. Fast Swap Program

• 1-Year Warranty valid within the United States

• 24–48 hour fast-swap replacement (USA only)

• Outside the U.S.: shipping costs for service are customer responsibility

This ensures therapy continuity without extended repair delays.

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🏢 Why Buy from American Oxygen (Doral, FL)

• Same-day pickup available

• Fast UPS shipping nationwide

• U.S.-based support team

• Assistance planning battery needs for travel

• Real customer service, not marketplace reselling

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❓ Frequently Asked Questions

What does Certified Pre-Owned mean?

A professionally refurbished device with new critical components and verified operational performance.

Is this FAA approved?

Yes. The unit is approved for airline use. Always confirm battery requirements with your airline.

How do I choose between single and double battery?

Single battery is lighter; double battery offers extended runtime.

Is this covered outside the U.S.?

Warranty applies to the device, but international shipping costs are the customer’s responsibility.

Does it deliver continuous flow?

No. This model provides pulse-dose oxygen only (settings 1–3).