The ARYA Airtivo Max Battery is a rechargeable lithium-ion battery that serves as the power source for the ARYA Airtivo Max portable oxygen concentrator. It allows the device to run continuously without being plugged into a wall outlet, enabling users to live freely and independently. The battery delivers a consistent oxygen supply and can be easily swapped with a spare or recharged using an AC power supply, a DC vehicle charger, or an external battery charger. With multiple charging options—at home via AC, on the road via a vehicle's cigarette lighter, or externally with a dedicated charger—users can ensure their oxygen therapy is always available. Battery life varies by flow rate, ranging from up to 5.4 hours at Pulse 1 to 1.7 hours at Pulse 6.