@curiouskitty . Yes, it is in addition to my Inogen portable and the stable concentrator I plug in at home.
I have original Medicare with a Medigap policy that covers what Medicare does not pay. My local Provider gives me 1) stable concentrator for home - I plug it in and use it for sleeping 2) Inogen portable with battery which I use for going out etc.
For traveling away from home, I call my provider 2 weeks before and tell them where I am going. If it is on their route they will drop a concentrator off where I am staying. When going to Florida I was going to the Keys so I picked up the concentrator at their office which was next to the Miami airport. In Rochester they have an office (Mayo Clinic good business for them!) and they deliver a concentrator to my hotel in Rochester, then they pick it up after. Hotel management in Rochester is used to this as other people also have oxygen dropped off. My provider does not charge extra for the service. But they will not give me extra batteries for travel so I bought my own.
Portable Inogen has a charger for the car, but I have not tried it.
Check out the SOAR bill for oxygen and call your Reps. The Supplemental Oxygen Access Reform (SOAR) Act (S.1406/H.R.2902), reintroduced in April 2025, is a bipartisan piece of federal legislation designed to reform Medicare payment policies for supplemental oxygen