A portable oxygen concentrator only works well for you, if the battery can last for as long as you need it to without needing to be recharged. Having the smallest portable oxygen concentrator you can get is usually also a high priority! As long as the portable model you want covers your oxygen needs, you shouldn’t have to get a large one to have a lasting battery.
There are several portable oxygen concentrators in the small category (5 pounds and under) with batteries that have the ability to last for as long as 8 hours or more. Battery life of an oxygen concentrator battery depends on the setting, the higher settings it won’t last as long, because it has to draw more electricity.
However, these small concentrator batteries will still last a lot longer than some of the others that are in the bigger size category. If you want a small oxygen concentrator with a long-lasting battery, you should check out these models.