Is a portable oxygen concentrator truly portable?
By definition, a portable unit needs to be light enough so that you don't feel burdened while carrying it around anywhere you need to go. You have to take into consideration the weight of the unit, including the weight of the battery and accessories you will be carrying around along with it. You might also need to bring along extra batteries and power supplies. You should always expect to add a few extra pounds for the additional batteries if you are out and about all day.