The Inogen One G2 24 Cell Battery will extend mobility time as each battery provides up to 8 hours of operation. Lasting between 6 to 8 hours (depending on flow rate), the Inogen G2 Lithium Ion Battery is the perfect power source for trips to the store, seeing a movie or a dinner out with friends. Having an extra battery on hand is a great way to make sure that you can get up and go whenever you want.