This is the AirSep FreeStyle 3's Internal Battery Replacement. It carries a 1-year warranty and can be replaced by us into your unit, or we can walk you through the process if you are comfortable working on electrical/mechanical devices.The replacement battery may have a black or white exterior. Direct replacement for the BT015. The AirSep Freestyle 3 Portable Oxygen Concentrator is a lightweight device weighing less than five pounds. The Freestyle is perfect for the on-the-go oxygen concentrator. It's an FAA approved device with multiple charging options and three different operational modes.
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