The Battery will power the Inogen One G4 without connection to an external power source.  When fully charged, a single battery will provide up to 2 hours of operation, a double battery will provide up to 4 hours of operation.

The battery recharges when properly installed in the Inogen Ong G4 and the concentrator is connected to AD or DC power.  Recharging time is up to 3 hours for a single battery and 5 hours for a double battery.