A: Refurbished means the G4 has been inspected, cleaned, repaired if necessary, and tested to meet strict performance and safety standards.
SKU: BA-400
Refurbished Inogen One G4 Portable Oxygen Concentrator – Ultra‑Light – Single (4 Cell)
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$1,275.00
$1,299.00
1.85% OFF
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Stay mobile with one of Inogen’s lightest portable concentrators at a lower cost with this refurbished Inogen One G4 portable oxygen concentrator. Weighing about 2.8 lb with a single battery, the G4 is built for shoppers who want a very small, easy-to-carry device for daily errands, appointments, and travel.
The Inogen One G4 is a pulse-dose portable oxygen concentrator with three settings (1–3), delivering oxygen in pulses when it detects inhalation. It is meant for users whose prescriptions allow pulse-dose therapy rather than continuous flow, so your clinician should confirm that a portable pulse-dose device is appropriate—especially for sleep or higher oxygen needs.
This unit is pre-owned and professionally reconditioned. It has been tested, inspected, cleaned, and sanitized for safe, reliable use; as a refurbished concentrator, it may show normal cosmetic wear, but the focus is dependable performance and battery function.
Battery runtime on this refurbished G4 will depend on your setting, breathing rate, altitude, and especially battery age. Many users add a spare or newer battery—or use DC power in the car—if they need more predictable runtime for longer days.
The Inogen One G4 is FAA-approved for in-flight use, making it a popular choice for flights and trips as long as airline battery and paperwork rules are followed. Always confirm your airline’s current requirements and bring enough charged batteries (often 150% of flight time plus ground time) before traveling.
Related parts
| Tube Connection | Cannula |
| Model | BA-400, BA-408 |
| HCPCS Codes | E1392 |
| Operating Modes | Pulse dose delivery (Intelligent Delivery Technology) |
| Altitude Adjustment | Up to 10,000 ft |
| Sound Level | ~40 dBA at flow setting 2 |
| Carrying Case | Yes |
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FAQs
Is this Inogen One G4 new, open box, or used?
This listing is for a used, refurbished Inogen One G4 portable oxygen concentrator, not a new or unused open‑box unit. Each device is professionally reconditioned, tested, cleaned, and sanitized for safe use, but normal cosmetic wear from prior ownership should be expected.
What type of oxygen delivery does the G4 provide?
The Inogen One G4 is a pulse‑dose portable oxygen concentrator, offering three flow settings (1–3). It delivers oxygen in pulses when it senses inhalation and does not provide continuous flow. Your clinician should confirm that a pulse‑dose POC meets your oxygen needs, particularly for sleep or higher flow requirements.
How long will the batteries last on a used G4?
When new, the G4 can provide up to about 2.7 hours on the single battery and up to about 5 hours on the double battery at setting 1. On a used unit, runtime will usually be shorter and depends on battery age, flow setting, breathing rate, temperature, and altitude. If long runtime is important, consider adding a spare or newer battery.
Can I fly with the Inogen One G4?
Yes. The Inogen One G4 is FAA‑approved for commercial air travel, so many users take it on flights. Airlines may require advance notice, documentation, and enough battery capacity to cover 150% of flight time plus waiting and delays, so always confirm your airline’s policy before you travel.
Who is this used G4 best for?
The G4 is best for people who want the lightest Inogen option and whose prescriptions fit within pulse‑dose settings 1–3—for example, many COPD and respiratory patients who mainly need support during activity or light daily use. It’s especially attractive if you prioritize small size and easy carry over the wider setting range and battery life of the G5.
Is this product covered by Medicare or my insurance?
Most of our products are sold as cash‑pay purchases. However, you can request an insurance‑ready receipt from us after your purchase. This detailed receipt includes the information many insurers ask for (such as item description, cost, and HCPCS code), so you can submit a claim yourself and ask your plan about partial or full reimbursement if out‑of‑network or self‑purchase benefits are available.