For Inogen G4 and OxyGO Portable Concentrator. Extended Battery. Slightly Used Next to buying NEW Battery. 8-Cell Battery BA-408. Why buy Single Battery, because it is lighter.
Tested and verified: it holds a charge for over 3 months. I sold them because I lost my G4 during a move. Barely used G4 BA408 extended Battery for Oxygo FIT & Inogen G4 Oxygen Fully TESTED.
Inogen BA-408 Battery SOLD FOR PARTS UNTESTED. Unable to test.