All battery purchases are final sale. There are no returns on batteries. The OxyGo Single 8 Cell Rechargeable Battery will power the OxyGo without connection to an external power source. When fully charged, a single battery will provide up to 4.5 hours of operation. The battery recharges when properly installed in the OxyGo and the concentrator is connected to AC or DC power. Recharging time is up to 4 hours for a single battery. The OxyGo battery acts as a secondary power supply in the event of a planned or unexpected loss of the AC or DC external power supply. When operating the OxyGo from an AC or DC external power supply, a properly inserted OxyGo battery should be maintained in the unit. This procedure will ensure uninterrupted operation and will operate all alarms and alerts in the event of a loss of the external power supply. Product Specifications Dimensions of Unit with standard battery: 8.75 in x 3.0 in x 7.25 in Weight: 4.8 lbs (2.2 kg) with standard battery installed Standard Battery Duration: Up to 4.5 hours Battery Recharge Time: 2-4 hours Voltage: 12.0 to 16.8 VDC Manufactured by Inogen
