A: It means the device has been inspected, repaired if needed, sanitized, and tested to meet performance standards—restoring it to like-new condition.
SKU: BA-300
Inogen One G3 Portable Oxygen Concentrator - Open Box | Single (8 Cell) | BA
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$995.00
$1,099.00
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Used Inogen One G3 Portable Oxygen Concentrator
Affordable portability for home use and travel (pulse dose)
If you want a portable oxygen concentrator from a trusted brand without paying new pricing, a used Inogen One G3 is a practical choice. It is designed to support mobility with a compact build, simple controls, and multiple pulse settings for day to day use.
This page is written for shoppers looking for an affordable Inogen, especially seniors, caregivers, and people who want a lighter oxygen therapy device for errands, appointments, and travel.
Why choose a used Inogen One G3
Buying used is often the easiest way to get a well known Inogen system at a more budget friendly price.
A used G3 is a good fit if you want
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Affordable medical oxygen equipment without giving up portability
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A dependable option for daily carry or as a backup unit
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A lightweight oxygen machine that is easier to transport than traditional tanks
Used condition note: pre owned devices may show cosmetic wear. What matters most is performance, included accessories, and battery condition.
Key features of the Inogen One G3
Portable and easy to carry
The G3 weighs 4.8 lb with a single battery and is sized to fit into everyday routines without feeling bulky.
Pulse dose oxygen delivery with 5 settings
This is a pulse dose oxygen concentrator with flow settings 1 to 5. It delivers oxygen in doses when it detects inhalation.
Important: pulse dose is not the same as continuous flow. If your prescription requires continuous flow oxygen, you should choose a continuous flow oxygen concentrator instead.
Quiet everyday operation
The Inogen One G3 is listed at 39 dBA on setting 2, helping it feel more discreet in many home and social environments.
One device for home use and travel
The Inogen One G3 is intended for use in multiple environments, including home and travel situations, and it is commonly chosen as an oxygen concentrator for travel.
Real specs (manufacturer listed)
Here are the core specs shoppers usually want up front.
Weight (with single battery): 4.8 lb
Dimensions (with single battery): 8.75 in (L) x 3.0 in (W) x 8.25 in (H)
Oxygen delivery mode: pulse dose
Settings: 1 to 5
Noise level: 39 dBA (setting 2)
Battery life (single battery): up to 4.7 hours (setting 1)
Battery life (double battery): up to 10 hours (setting 1)
Recharge time (approx): 2 to 4 hours (single) and 4 to 8 hours (double)
Battery life on a used unit (what to expect)
Battery time depends on your setting, breathing rate, and battery health. For used machines, battery condition matters a lot.
If you want more predictable runtime, many buyers choose to add
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an extra battery for longer days
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a newer replacement battery if the included one is older
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a DC power option for car trips
FAA approved oxygen concentrator (travel note)
If you are searching for an FAA approved oxygen concentrator, Inogen states that its portable systems meet FAA acceptance criteria for use onboard aircraft, and the G3 is commonly used for air travel.
Airline rules can vary, so always confirm your carrier’s requirements and plan enough battery time for your full travel day.
Inogen One G3 vs G4 vs G5 (quick buying guidance)
If you are comparing models, here is the simple way to choose:
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Choose the G3 if you want a value friendly Inogen with settings 1 to 5 and strong portability
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Choose the G4 if your top priority is the lightest carry and your prescription fits lower settings
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Choose the G5 if you want the widest setting range and longer listed battery options
If you tell us your prescribed setting and when you plan to use your concentrator (home, walking, travel), we can help you pick the right match.
Comparison table (Inogen G3, G4, G5)
| Model | Delivery | Settings | Weight (lb, std batt) | Noise (dBA @ setting 2) | Dimensions (in, L×W×H) | Battery Std (hrs @ setting 1) | Battery Ext (hrs @ setting 1) | Best for | Notes |
| Inogen One G3 | Pulse dose | 1–5 | 4.8 | 39 | 8.75 × 3.0 × 8.25 | 4.5 | 9 | Value-focused portability | Older-gen model; good balance of settings and portability. |
| Inogen One G4 | Pulse dose | 1–3 | 2.8 | 40 | 5.91 × 2.68 × 7.2 | 2.7 | 5 | Lightest carry, short outings | Smallest/ lightest in this group; fewer settings (1–3). |
| Inogen One G5 | Pulse dose | 1–6 | 4.7 | 38 | 7.19 × 3.26 × 8.15 | 6.5 | 13 | Longest runtime, widest range | Most settings (1–6) and longest listed battery runtimes. |
Want an affordable Inogen
If you are looking for an affordable Inogen portable oxygen concentrator and want help choosing between used options, open a chat with us. We will help you confirm the right setup and accessories based on your prescription and lifestyle.
Related parts
| Tube Connection | Cannula |
| Model | BA-300, BA-316 |
| HCPCS Codes | E1392 |
| Operating Modes | Pulse dose delivery |
| Altitude Adjustment | Up to 10,000 ft |
| Sound Level | ~39 dBA at flow setting 2 |
| Carrying Case | Yes |
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