Below is a detailed comparison of plastic, metal, and custom IP66 battery enclosures to help you choose the best solution for your application. Durable IP66 cases and junction boxes are available in a variety of sizes and styles. The IP66 rating ensures complete protection against dust ingress (first digit '6') and powerful water jets from any direction (second digit '6'), making these enclosures ideal for. . Buy direct from manufacturer IP65 and IP66 waterproof junction boxes and electrical enclosures. Keep your internal electronic and electrical components safe with our waterproof IP and Nema enclosures. Who is. . Battery enclosures serve as critical protective housings for battery cells, battery packs, and complete battery management systems across a wide range of applications. Whether protecting lithium ion batteries in electric vehicles, housing industrial lead acid battery banks for backup power systems. . The IP Code defines the degree of protection as "IP" followed by two numbers; the first digit reflecting in degrees the level of protection against particles, and protection to others from enclosed hazards, and the second digit indicating the extent of protection against water.