McMurdo SART S4 SART II Battery Lithium: The McMurdo SART S4 SART II Battery provides a reliable power source for the McMurdo SART devices. This lithium battery is designed to ensure long-lasting operation, crucial during search and rescue missions. The battery is easy to replace and ensures that the SART device remains fully operational when distress signals need to be sent. The lithium technology ensures a longer lifespan and better performance in harsh maritime environments. This replacement battery ensures the continued functionality of vital maritime safety equipment.