attwood Vented Battery Box for Group 29/31 Batteries — Large Black, Acid-Resistant Polypropylene with 350 lb Strap

This vented battery enclosure combines chemical-resistant construction, an engineered vent system, and a high-strength hold-down strap to protect batteries in demanding marine and recreational environments. Built from acid-resistant polypropylene and tested across a wide temperature range, the box balances durable protection with user-focused features like molded instructions and oversized carrying handles. It’s designed to reduce gas accumulation, shed water intrusion, and anchor large batteries reliably for OEM or aftermarket installations.

How does the Attwood 9084-1 keep batteries safe on a boat or RV?

The box uses a vented lid and upward-facing vents to help channel battery gases safely away while limiting water entry. Thick-walled, impact-tested polypropylene protects the battery from spills, impacts, and corrosion, and the integrated strap secures the battery against movement during rough conditions.

• Vented lid with four cable entry points to route leads neatly.
• Acid-resistant polypropylene resists corrosion from battery acid.
• Impact-tested from -20°F to +120°F for extreme environments.
• Heavy-duty strap rated to 350 lbs. for robust anchoring.

Will this box fit my Group 29 or Group 31 battery?

Yes—the interior dimensions accommodate larger batteries common in marine and RV systems. The box supports batteries up to 9-3/4 inches tall and provides sufficient length and width for Group 29 and Group 31 sizes, while leaving space for cable routing and ventilation.

• Inside dimensions: 15-7/16" L × 6-15/16" W × 9-3/4" H.
• Outside dimensions: 18-7/8" L × 9-1/4" W × 10-1/4" H.
• Four cable openings to fit common battery terminal layouts.
• Designed specifically for Group 29 and 31 battery profiles.

How easy is installation and daily use?

Installation is straightforward with included mounting hardware and a purpose-built hold-down strap. Large rolled-edge handles make carrying and positioning simpler, and molded-in instructions on the box offer quick reference for correct setup.

• Comes with mounting hardware for fast attachment to decks or compartments.
• 40-inch strap included; rated for 350 lbs. of force.
• Large handles simplify transport and placement aboard a vessel or RV.
• Molded-in instructions reduce guesswork during installation.

Does this meet marine safety and regulatory standards?

The Attwood 9084-1 is manufactured to align with established marine safety criteria for onboard battery enclosures. Meeting ABYC E-10 and USCG specifications makes it suitable for both factory installations and aftermarket replacements where compliance matters.

• Conforms to ABYC Standard E-10 for battery containment.
• Meets USCG Specification 183.420 requirements.
• Strap strength far exceeds minimum Coast Guard anchoring tests.
• Vented design reduces trapped gases to improve onboard safety.

Who is this for: The Attwood 9084-1 is aimed at boat owners, RV enthusiasts, marinas, and professional installers who need a dependable, standards-compliant battery enclosure for larger Group 29 or 31 batteries. It’s a good choice when corrosion resistance, secure hold-down capability, and built-in ventilation are priorities—particularly for users who require a robust, long-lasting solution that simplifies wiring and meets regulatory expectations.