If you've ever stared at a list of battery model numbers — BA-300, BA-316, BA-400, BA-500, BA-516 — and thought "why does this have to be so confusing?", you're not alone.
The good news? Once you know your device model, picking the right battery is actually very simple. You just need one chart.
I've put together every Inogen and OxyGo battery pairing in one place, including the ones that look compatible but aren't. No more guessing. No more returns because you ordered the wrong one.
The Master Compatibility Chart
This is the chart you came for. Find your device on the left, then look across for the batteries that work with it.
| Device | BA-300 (8-Cell) |
BA-316 (16-Cell) |
BA-400 | BA-500 (8-Cell) |
BA-516 (16-Cell) |
|---|---|---|---|---|---|
| Inogen One G3 | ✅ | ✅ | ❌ | ❌ | ❌ |
| Inogen One G4 | ❌ | ❌ | ✅ | ❌ | ❌ |
| Inogen One G5 | ❌ | ❌ | ❌ | ✅ | ✅ |
| Inogen Rove 4 | ❌ | ❌ | ✅ | ❌ | ❌ |
| Inogen Rove 6 | ❌ | ❌ | ❌ | ✅ | ✅ |
| OxyGo (Original) | ✅ | ✅ | ❌ | ❌ | ❌ |
| OxyGo FIT | ❌ | ❌ | ✅ | ❌ | ❌ |
| OxyGo NEXT | ❌ | ❌ | ❌ | ✅ | ✅ |
A few things to notice:
- G3 and G5 both use 14.4V batteries. Same voltage. Still not compatible. The connectors are shaped differently and the communication chip inside the battery speaks a different "language" to each generation.
- Rove 4 = G4. Rove 6 = G5. OxyGo FIT = G4. OxyGo NEXT = G5. These are rebranded versions of the same hardware — the batteries are identical.
- The original OxyGo (not FIT, not NEXT) uses the same batteries as the Inogen One G3.
I've personally helped a handful of people who bought a G5 battery for their G3 because the Amazon listing said "compatible with Inogen." Don't trust the listing title — trust the model number on your current battery. If yours says BA-300, you need another BA-300 (or BA-316 for longer runtime). Full stop.
Why Aren't Inogen Batteries Interchangeable?
This is the question I get asked most often. "If the voltage is the same, why can't I use a G5 battery in my G3?"
Three reasons:
1. Physical Connector Shape
The battery connector — the plastic slot and metal pins that slide into the device — is shaped differently between generations. A G5 battery physically won't seat into a G3 device. It's like trying to plug a USB-C cable into a micro-USB port. Same job, different shape.
2. Communication Protocol
Each Inogen generation uses a different chip inside the battery that talks to the device. This chip reports the charge level, temperature, cycle count, and health status. G3 devices speak "protocol A." G5 devices speak "protocol B." Even if you could force the connector to fit (please don't try), the device wouldn't recognize the battery.
3. Power Management Differences
Newer Inogen models (G5, Rove 6) have more efficient power management circuits. They draw current differently and monitor battery health with more sensors. An older G3 battery lacks the hardware to report the data a G5 expects.
Inogen didn't make batteries incompatible to sell more of them. Each generation improved on the power system, and those improvements required different battery hardware.
If your device is showing a "Check Battery" or "Battery Error" message even with the correct battery, that's usually a different issue — dirty contacts, a worn-out cell, or a charging problem. Head over to the troubleshooting guide for step-by-step fixes for 7 common battery problems.
G3 Battery Options (BA-300 & BA-316)
If you have an Inogen One G3 or the original OxyGo, these are your batteries:
| Battery | Cells | Capacity | Runtime (Setting 1) | Weight | Charge Time |
|---|---|---|---|---|---|
| BA-300 | 8-cell | 92Wh / 6.4Ah | ~4.5 hours | ~1.3 lbs | ~4 hours |
| BA-316 | 16-cell | 184Wh | ~10 hours | ~2.3 lbs | ~8 hours |
Which one should you pick?
The BA-300 is lighter and cheaper. It's enough for a trip to the grocery store or a few hours out of the house. The BA-316 gives you more than double the runtime — great for all-day outings or if you don't want to carry a spare. The trade-off is weight and price.
I've noticed a lot of G3 users keep one of each: the 8-cell for short errands, the 16-cell for longer days. It's a solid setup if your budget allows.
Find BA-300 and BA-316 batteries for G3 →
G4 / Rove 4 / OxyGo FIT Battery (BA-400)
The G4 generation is simpler — there's only one battery model:
| Battery | Cells | Capacity | Runtime (Setting 1) | Weight | Charge Time |
|---|---|---|---|---|---|
| BA-400 | 8-cell | 50.9Wh / 3.5Ah | ~2.7 hours | ~1.1 lbs | ~3 hours |
The G4 is the lightest Inogen model, and its battery reflects that. The runtime is shorter than G3 or G5, but the trade-off is portability. If you need more time away from an outlet, carrying a spare BA-400 is light enough that you won't notice the extra weight.
Find BA-400 batteries for G4 and Rove 4 →
G5 / Rove 6 / OxyGo NEXT Battery Options (BA-500 & BA-516)
The G5 generation gives you two battery choices, and they're dramatically different in runtime:
| Battery | Cells | Capacity | Runtime (Setting 1) | Weight | Charge Time |
|---|---|---|---|---|---|
| BA-500 | 8-cell | 92.16Wh / 6.4Ah | ~6.5 hours | ~1.1 lbs | ~3 hours |
| BA-516 | 16-cell | 92.2Wh × 2 | ~13 hours | ~2.2 lbs | ~6 hours |
Which one should you pick?
The BA-500 is the everyday battery. Six and a half hours covers most people's daily outings. It's light, it charges fast, and it's the more affordable option.
The BA-516 is the travel battery. Thirteen hours on a single charge means you can go a full day without swapping. It's what you want for long flights, road trips, or days when you won't have access to an outlet.
One thing worth knowing: the BA-516 is actually two 8-cell packs in one housing. That's why it's heavier and takes longer to charge. But it also means you get nearly double the runtime without carrying a separate spare.
Find BA-500 and BA-516 batteries for G5 and Rove 6 →
OxyGo vs Inogen: What's Actually Different?
This confuses a lot of people. OxyGo is a brand that sells rebadged Inogen devices. The hardware inside is identical.
| OxyGo Model | Equivalent Inogen Model | Compatible Batteries |
|---|---|---|
| OxyGo (Original) | Inogen One G3 | BA-300, BA-316 |
| OxyGo FIT | Inogen One G4 / Rove 4 | BA-400 |
| OxyGo NEXT | Inogen One G5 / Rove 6 | BA-500, BA-516 |
So can you use an Inogen battery in an OxyGo device? Yes — as long as it's the right generation. An Inogen BA-500 works perfectly in an OxyGo NEXT. An OxyGo FIT battery works in an Inogen G4. They come from the same factory.
Does using a "non-OxyGo" battery void the warranty? No. OxyGo's warranty covers the device, not the battery brand. And most replacement batteries come with their own 12-month warranty anyway.
How to Find Your Device Model (If You're Not Sure)
Not everyone knows their exact Inogen model off the top of their head. Here's how to check:
- Look at the device label. The model name is printed on the bottom or back of the unit. It'll say "Inogen One G3," "Inogen One G4," "Inogen One G5," "Rove 4," or "Rove 6."
- Check the battery you already have. The battery itself has a model number printed on it — BA-300, BA-400, BA-500, etc. That tells you both the battery model and (by extension) the device generation.
- Look at the user manual. The front cover or first few pages will state the model.
- Check your purchase receipt or prescription. The device model is usually listed.
If you're still not sure, take a photo of the label on the bottom of your device and compare it to images online. The G3, G4, and G5 all look noticeably different.
Frequently Asked Questions
Can I use a G5 battery in my G3 if the voltage is the same?
No. Even though both use 14.4V, the physical connector is a different shape and the communication chip inside the battery isn't recognized by the older device. It won't physically fit, and even if it did, it wouldn't work.
What happens if I try to force the wrong battery in?
Best case: it won't fit and you'll realize your mistake. Worst case: you could bend the connector pins or crack the plastic housing on either the battery or the device. Repairing a damaged battery slot on the device itself is expensive. Don't do it.
Are Rove batteries the same as Inogen batteries?
Yes. Rove is Inogen's newer branding for the same hardware. Rove 4 = G4. Rove 6 = G5. The batteries are identical — you can use an Inogen BA-500 in a Rove 6 without any issues.
Can I use a BA-500 from one G5 in a different G5?
Yes. All G5 devices use the same BA-500 (8-cell) or BA-516 (16-cell) batteries. You can swap batteries between G5 units freely, as long as both are G5 generation.
How do I know if my battery is 8-cell or 16-cell?
The easiest way is weight. An 8-cell battery weighs about 1.1 lbs. A 16-cell weighs about 2.2 lbs — it's noticeably heavier and thicker. You can also check the model number on the battery label: BA-300, BA-400, and BA-500 are 8-cell. BA-316 and BA-516 are 16-cell.
Will a third-party compatible battery work the same as OEM?
Most quality third-party batteries (from reputable brands like Cameron Sino) work fine as long as you match the exact model. Check that the voltage, capacity, and connector match the OEM specs exactly. Third-party batteries may have slightly different runtime — sometimes a bit more, sometimes a bit less — but the difference is usually small.
Can I use an external charger with any Inogen battery?
External chargers are model-specific too. The BA-503 external charger works with G5 batteries (BA-500 and BA-516). If you have a G3 or G4, you'll need the charger designed for that generation. Mixing chargers across generations can damage the battery.
What does it mean when my device says "Check Battery" with a compatible battery?
If you're sure the battery is the right model but the device shows an error, try cleaning the metal contacts on both the battery and inside the battery bay. If that doesn't fix it, the battery itself may have a fault. See the troubleshooting guide for detailed steps.
References & Sources
- Inogen One G5 User Manual — Battery specifications and compatibility
- Inogen One G4 User Manual — Battery specifications
- Inogen Battery Care Card (Official PDF) — Official battery guidelines
- Inogen Customer Support — Official compatibility confirmation
Find the Right Battery for Your Device
Now that you know exactly which battery fits your Inogen or OxyGo, you can grab the right one.
Browse Batteries by Model →All batteries come with a 12-month warranty and FAA approval for air travel.
