Product Specifications Inogen One G5 Single Battery (8-Cell) BA-500 - BRAND NEW Product Features Lasts up to 6.5 hours Recharges in 3 hours with AC or DC power supply Quick release button Non slip grip base Product Weight 8 ounces Battery Charging Time Approximately 3 hours Battery Duration Up to 6.5 hours (Settings-3) FAA Approved Yes Manufacturer Inogen Return Policy Unopened unused products may be returned for a refund, although we will be taking a 20% restocking fee. They must be returned at the customer's expense in their original packaging and meet the following conditions: Product must be in new condition. Product can't be opened or used Product must be returned in its original packaging. All Health and Personal Care items that come in contact with the body can't be returned if they have been opened