All battery purchases are final sale. There are no returns on batteries. The Respironics SimplyGo Oxygen Concentrator Lithium Ion Battery is the key to SimplyGo's mobility. There is no limit to how many batteries you can own. Need more time with your Portable Oxygen Concentrator? Just take along a few extra batteries (or 3. or 4 or 5), and you're good to go! Let the explorations and adventures begin! 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
