With rapid iterative material innovation, simplified product design and a constantly improved manufacturing process, Hilong has made significant breakthroughs in system energy density and  ultra-long range to facilitate your driving experience. Hilong use the hard metal case to protect the battery pack and the battery is waterproof, in normal working condition, the battery can working properly even it is socking in the water. Our battery can deeply discharge for over 2K times and can be used for 5-8 years.