Nancy F.
Freedom? only if you need oxygen for 30 minutes...
While my Inogen One allows me to have oxygen on the go, it does not last more than 30 minutes on setting 4. So what use is it if I am traveling and the trip is more than 30 minutes? Or I get stuck in traffic? Or any number of other things. Reading the information booklet and seeing all the ads induced me to believe that the battery lasted longer than that, so I only ordered the single battery. Since you can ONLY charge the battery in the unit, another important fact that was left out of the documentation, I am SOL if I don't have a car or an electrical plug available. And I can only assume the double battery would only have a 60 minute lifespan.



