Portable oxygen concentrator

I talked to someone from Inogen and they told me that G5 has been discontinued and new model now Rove 6. They said also that when one goes through Medicare one gets a refurbished model not above G3. I also asked if I buy the model, will Medicare cover the "maintenance" and they said no. But Medicare site says it does.
I learned long ago to not take the first answer and keep asking until I am satisfied!!!
Do you need oxygen at night? They suggested I could use the portable model for my night needs (I am waiting for test results). I am thinking that might consume the batteries faster so better to have a stationary concentrator if I need at night.
Also I wonder about servicing to be sure that the machine is continuing to perform correctly.
My prescription says something about evaluate to maintain oxygen% at 90. So I need someone to check it if I buy it. Whereas if I go through Medicare it is part of the contract obligation.

If you are using it at night, most likely you will be near an outlet so you can recharge. It can recharge when in use if plugged into an outlet, just not in the car from my experience.

Thanks.
I have learned a few things in these days
1) Continuous vs pulse flow. Mayo measures only with continuous flow which they consider the gold standard.
Light weight portables are pulse flow. A continuous flow portable would weigh more and I would have to drag something. For now I can get by with pulse flow, if I should worsen, I may need continuous flow, because pulse flow cannot deliver same amount. I need 2L/min continuous flow and that is not the same as 2 on a pulse flow.. I would sell my Inogen in that case.
2) I am covered under Medicare, but if I go through Medicare, I do not know what the provider will give me, certainly not a new model. But Medicare says it will cover maintenance if I buy my own unit. I will have to figure out how to do this.
3) I bought the new Inogen Rov 6 directly from Inogen. I will need to test it to see if it gives me 90%+ oxygen saturation when I exercise...using my home oximeter. If not I need to return in 30 days
4) I also need night oxygen, and I will go through Medicare for that so no cost for me. And if I am travelling I can use the Inogen for night oxygen

I was told I had to have continuous flow at night. I have the Inogen Rove 6. ???

I was going to visit my son & had thought I could use portable concentrator plugged in to wall socket at night. Dr said not safe in case I took shallow breaths or skipped a breath. There is an alarm to wake up if no breath but he said might be wakened all night long.

I have a RhythmCare small concentrator from medicare that I use most but only good for 4 hrs, so I bought the Rove 6 for longer use & bc it is a bit quieter. But it is really heavy, especially with larger battery that gives up to 10 hrs

I was going to visit my son & had thought I could use portable concentrator plugged in to wall socket at night. Dr said not safe in case I took shallow breaths or skipped a breath. There is an alarm to wake up if no breath but he said might be wakened all night long.

I have a RhythmCare small concentrator from medicare that I use most but only good for 4 hrs, so I bought the Rove 6 for longer use & bc it is a bit quieter. But it is really heavy, especially with larger battery that gives up to 10 hrs

My doctor revised my prescription after the overnight oximetry came in...so he is prescribing O2 at night and for activity - not for sitting in front of TV.
Surprise, my Medicare provider brought out a nice continuous flow concentrator for night and a Inogen One G5 for portable (pulse dose), but no extra batteries. So I am trying it out now to see if it keeps my O2 at 89 and above during exercise. I was given 2L/min prescription, and I don't think the 2 setting will do it and will try at 3 on the Inogen. But 4.7 lbs is heavier than one thinks!
I have an Inogen Rov 6 arriving next week. If I want to travel I need something with extended batteries - and they cost!