The External Battery Module allows the user of the SimplyGo to extend the time needed between battery changes. The SimplyGo External Battery Module plugs into the concentrator on the side where you would normally connect your AC or DC charger.
The SimplyGo first uses the power from the external battery and then swops over to the battery installed in the unit. This effectively doubles the life of the battery and at the same time reduces the need to change out batteries. The module fits perfectly into the front pocket of the SimplyGo carry case.