This document provides requirements and recommendations for the selection and installation of lithiumion batteries for boats. It applies to lithium-ion batteries and battery systems with a capacity greater than 500 Wh used on small craft for providing power for general electrical loads and/or to electric propulsion systems. It is primarily intended for manufacturers and battery installers. WARNING Lithium ion batteries used in direct current (DC) electrical systems on boats that operate at potentials of 60 V or higher have additional safety requirements not addressed by this standard. Refer to the battery manufacturer s recommendations.