This is a new and genuine rechargeable battery with a battery capacity of 3.5Ah/50.9Wh and a voltage of 14.54V. It is specifically designed for use with Inogen G4 OxyGo devices and is compatible with BA-400 1400-2010-4, 1400-2000, and 1400-2030 models. This rechargeable battery is made of lithium-ion and was manufactured in China. It is a reliable source of power for your Inogen G4 OxyGo device and will keep it running for an extended period.