Inogen One G2 24-Cell Double Battery

Extended Capacity 

Last one

Fit Inogen & OxyGo Portable Concentrator  

Used as a Backup Battery

Next to buying NEW Battery

Fully Tested

May has Minor Scratches & Dents  

does not affect operation

Great Deal for discounted Price

Price Reduced

BA-224

I believe in a fair price for what you are getting, 

As with any battery, be sure to check it a few times at home prior to hitting the road!