Small portable oxygen concentrators & battery life.
When you need a portable oxygen concentrator (POC) you will look most possibly for the smallest one as you don’t want to carry or pull around a large and heavy machine. The Airsep Freestyle is currently the smallest portable oxygen concentrator around but being so small it has the disadvantage that it only gives a flow form 2-3 litres per minute and price wise does it not vary much from other models that give up to 6 litres of oxygen per minute.
The other consideration will most likely be the battery life of portable oxygen concentrators. When people start to shop around for a portable concentrator (POC) they often decide that the Philips Evergo or the Inogen One are the machines to go for. The reason being the number of hours they can use the POC if they are going out as the technical data specifies 8 hour use without recharge. But let’s face it, who is going where that there are no power outlets nearby. One can plug in his or her battery charger at a friends place, in every restaurant, coffee shop not to mention the cigarette lighter in the car. This way the battery does not need to be so big and heavy.
The most popular model at this moment that covers about everybody’s needs is either the Sequal Elcipse 3 (which has both a pulse and constant flow of oxygen but needs to be wheeled around on a trolley) or the Invacare XPO2 which is pulse operated but can be carried around with a shoulder strap.