ResMed's LifeChoice Activox 4L offers the longest lasting internal battery of any portable oxygen concentrator. Activox 4L's Pulse-Wave, delivers oxygen up to 4 LPMeq, in a concentrator that weighs less than 5 pounds. With an internal battery, AC and DC power all included the Activox 4L is a great option for people with high oxygen requirements who don't want to compromise on battery life, weight or ease of use.
Inova Labs -
XYC200 (Standard Bundle with Internal Battery), XYC100 (Freedom Bundle with Internal Battery & External Battery Pack)
At just 4.9 pounds the LifeChoice® Portable Oxygen Concentrator delivers true mobility and independence for oxygen users with active lifestyles. The LifeChoice POC comes with an attractive, lightweight carry case so that it is easy to bring with you wherever you go. And LifeChoice's Auto Mode Technology adjusts oxygen on demand -- from active use to sleep mode -- so you can use it 24-hours a day 7-days a week 365-days-a-year for all of your oxygen needs.