Embrace the power of freedom with the Caire FreeStyle Comfort 8-cell battery, that empowers you to break free from the constraints of traditional oxygen therapy. With its industry-leading battery life, you can enjoy up to 4 hours of uninterrupted oxygen therapy on a setting of 2, allowing you to reclaim your independence and experience life on your terms. Say goodbye to worries about running out of oxygen and hello to the freedom to explore, engage, and embrace every moment. While each FreeStyle Comfort comes equipped with an 8-cell lithium-ion battery, many of our customers choose to have an additional battery as a backup or to extend their current battery life. Enter the FreeStyle Comfort 8-cell battery, the perfect companion to unlock even more hours of freedom while ensuring you enjoy the lightest overall package. Compact and lightweight, it seamlessly fits into your purse, handbag, or backpack, adding up to 4 hours of battery life on a setting of 2. Or if you don't mind a slightly heavier package in exchange for double the battery life, you should check out the Caire FreeStyle Comfort 16-cell battery. The Caire FreeStyle Comfort 8-cell battery liberates you from the limitations of traditional oxygen therapy. It allows you to venture out, engage with loved ones, and embrace your passions without the constant concern of oxygen supply. Battery life ranges from up to 8 hours on setting 1 to 2 hours on setting 5.