Keep your freedom of movement uninterrupted with the genuine BA-K201 replacement battery for your Cairs K/S Series Portable Oxygen Concentrator (POC). This brand new, high-quality battery delivers reliable power with a 49Wh (3.4Ah) capacity and stable 14.4V output, designed to extend your active time away from an outlet. Built with Grade A Li-ion cells and backed by a 12-month warranty, it ensures a perfect, safe fit and consistent performance for your essential respiratory device.