Inogen One G4 4 Cell Battery Inogen One G4 $374 8 Cell Battery Inogen One G4 $569 Desktop Charger Inogen One G4 $314 Carry Bag Inogen One G4 $39 Backpack Inogen One G4 $110 Particle Filter Inogen One G4 $35 Carrying Strap Inogen One G4 $20 Replacement Columns Inogen One G4 $129 AC Power Supply Inogen One G4 $164 DC Power Cord Inogen One G4 $72 Hip Bag Inogen One G4 $65 Output Filter Replacement Kit Inogen One G4 $35 User Manual Inogen One G4 $19