Check the listing for details. NEW Inogen G4 (OxyGo Fit) 4 cell BA-400 Battery. Condition: Open box. Listed at 75.00 USD. These batteries were manufactured between 2021 and 2023 and are New "Open Box" items. Even though they are new, we test each and every one of them with our in house G4 POC units. Upon ordering, you will NOT receive the original box for the battery. You will only receive the new battery. We do accept refunds and or exchanges and have excellent customer service. Not only do you get a great deal on these units, but you get 1 Business Day order processing, and Free Priority Mail Shipping! All of our batteries are shipped with a full charge and are ready to be used upon arrival. Don't be fooled by other sellers who only "charge" their batteries and say they are tested, there is a huge difference between charged tested and POC Tested!Please review what our customers say about our products and service! Sorry No International Shipping even if you are using a US Global mailing address