The Inogen One G4 doesn't have the long battery runtime of the G2 and G3. With this 8 cell battery, you can increase your mobility dramatically.
Battery Charge time Running time Weight
4 cell (BA-400) +/- 3 hours up to 2 hours 0,3 kg.
8 cell (BA-408) +/- 5 hours up to 4 hours 0,5 kg.
With the concentrator, you can charge one battery at a time. To charge multiple batteries, or separately from the concentrator, you can use the external battery charger.