The Inogen One G5 Double Battery (SKU: BA-516) is a high-capacity, lithium-ion battery designed to significantly extend the usage time of your Inogen One G5 Portable Oxygen Concentrator. This double battery is ideal for users who require prolonged oxygen therapy or for those who frequently travel and may not always have immediate access to a power source. When fully charged, it provides up to 13 hours of use at a flow setting of 1, ensuring that you can stay active and mobile without the constant need to recharge. The G5 Double Battery is designed for convenience and efficiency. It can be charged using the G5 External Battery Charger or while connected to the Inogen G5 unit and a power supply. The battery is capable of being fully recharged in under 3 hours, minimizing downtime and enhancing usability. It's small enough to fit in a backpack, accessory bag, or purse, making it extremely portable.