Respironics SimplyGo Lithium Ion battery

All Battery Sales Are Final. There Are No Returns Respironics SimplyGo Oxygen Concentrator Battery is the key to SimplyGo's mobility. There is no limit on how much batteries you may own. Need more time with your Portable Oxygen Concentrator? Just take along extra batteries (or even 3. 4 or 5!), and you're covered for the oxygen time you need!  SimplyGo Oxygen Batteries are compact and lightweight (at about 1.5 lb. each), and very accessible. The SimplyGo Batteries are very simple to change. All you gotta do is: slip out the used battery and slip in the new/recharged battery! And that's it, you're good to go another few hours! SPECIFICATIONS   Product Features Small and Lightweight Lasts 3 hours when fully charged on a setting of 2Includes Battery Life Indicator: 100%, 75%, 50%, 25% Dimensions 4.5" Wide x 7" Long x 1.5" High Product Weight 2 pounds Warranty 90 Day Warranty FAA Approved Yes Manufacturer Respironics