NOCO 4D Battery Box HM408 — Vented Commercial-Grade 12V Enclosure with Acid Reservoir

The NOCO HM408 is a commercial-grade, vented battery enclosure engineered to securely house a single group 4D 12V battery for marine, RV, trailer, and commercial use.

If you need a durable, code-compliant box to protect a large deep-cycle or starting battery in harsh conditions, the NOCO HM408 provides a weather-resistant, ventilated, and acid-safe housing built for boats, campers, work equipment, and generators. It combines heavy-gauge design details—like oversized cable entry, a captive lid, and an acid reservoir—with impact and chemical resistance to extend battery life and improve onboard safety.

How does this box keep batteries safe in boats and RVs?

The HM408 is designed to limit water intrusion, capture corrosive acid runoff, and vent gases away from living spaces and electronics. Its molded reservoir collects spilled acid while full-flow ventilation helps disperse hydrogen and other battery gasses safely.

• Integrated acid reservoir captures spills and corrosion liquids.
• Full-flow vents expel battery gasses away from compartments.
• Secure lid and corner fastening reduce movement during travel.
• Terminal protection to prevent accidental contact and shorting.

Will it handle heavy wiring and tough environments?

Yes—large cable entry ports accept heavy-gauge battery cables needed for high-amp charging and trolling-motor setups. The rotationally molded construction resists UV, oil, gasoline, and impact down to very low temperatures, making it suitable for prolonged outdoor or marine exposure.

• Oversized cable holes for thick gauge cables and busbar connections.
• Impact-resistant material rated for extreme cold and rough use.
• Chemical- and UV-resistant to prevent cracking and degradation.
• Captive lid and four-corner fasten points for solid mounting.

Does the NOCO HM408 meet marine and safety standards?

The HM408 is tested to accepted marine codes and industry guidance to ensure a compliant installation on boats and similar vessels. Certification and design features align with United States Coast Guard and ABYC recommendations for battery enclosures.

• Built to meet USCG Code of Federal Regulations guidance.
• Conforms to ABYC E-10.7 specifications for battery compartments.
• Designed to reduce the risk of spills, vapors, and shorts.
• Ready for installation in commercial and recreational systems.

Who is this for? The NOCO HM408 is aimed at boaters, RV owners, trailer and generator technicians, and commercial operators who need a robust, code-aware solution for storing a single 4D battery. If you require a vented, impact-resistant battery box with room for heavy cables and reliable spill management, this box is built to perform in demanding environments and make installations neater and safer.