You should have your unit checked I am on 2 liters continuously also and I last between 3 and 4 hours.
That's a great Question!!! Don't know why not, they should take care all customers needs!!!
Yes I have a car charger but waiting on my insurance to approve another battery. I'm on continuous flow if 2 liters and the battery runs down in about 40 to 45 minutes
Maybe they don't have outlets at the tables
Maybe the person with the portable oxygen concentrator should be more prepared
Thanks! Your answer is awaiting moderation.