The External Battery for Activox? Portable Oxygen Concentrator is an additional battery that can be used in addition to the internal battery of the Activox? Portable Oxygen Concentrator. The external battery is connected to the concentrator to provide up to 4.75 hours of additional usage.
The manufacturer lists these run times for the external battery:
The battery recharges in approximately 2 hours if completely drained. This is the battery only and does not include any other items.