attwood Vented Battery Box for Group 29/31 Batteries — Black, Heavy-Duty Polypropylene, 350 lb Strap

The Attwood 9084-1 is a heavy-duty vented battery box that safely secures Group 29 and 31 batteries for marine and RV use while meeting ABYC and USCG standards.

Built from acid-resistant polypropylene and engineered for extremes, this battery box delivers long-term containment and ventilation where corrosion, vibration, and moisture are concerns. It combines a vented lid, reinforced handles, and a robust hold-down strap to protect battery hardware and reduce maintenance in wet or mobile environments.

How does the Attwood 9084-1 protect batteries from corrosion and impact?

The enclosure is molded in acid-resistant polypropylene that resists battery acid and salts often encountered in boats and RVs. Its impact-tested construction performs reliably across a wide temperature range so the box maintains shape and strength in cold and hot conditions.

• Acid-resistant polypropylene construction for chemical protection.
• Impact-tested from -20°F to +120°F to resist cracking or deformation.
• Rolled-edge handles reduce stress points and prolong life under load.

How does the vented lid and cable routing improve safety and usability?

The lid integrates upward-facing vents to allow battery gases to escape while minimizing the chance of water entering the box. Four cable openings provide flexible routing options, making it easier to connect terminals without exposing the battery to the elements.

• Upward-facing vents channel gases away from surrounding compartments.
• Four molded cable entries for tidy and secure wiring runs.
• Lid design reduces direct water intrusion while maintaining ventilation.

What ensures the battery stays firmly in place during rough conditions?

An included heavy-duty hold-down strap secures the battery to the base and is rated for high loads to prevent movement. The strap and mounting hardware meet or exceed common marine hold-down requirements so the battery remains stable in heavy seas or bumpy roads.

• 40-inch heavy-duty strap rated to 350 lbs. of force for strong retention.
• Mounting hardware included for fast, secure installation.
• Meets ABYC E-10 and USCG 183.420 specifications for hold-down systems.

What size batteries fit and what are the key dimensions to check?

This Attwood box is sized specifically for larger Group 29 and Group 31 batteries, with internal and external measurements provided for straightforward planning. Confirm your battery’s height and terminal placement before installation to ensure clearance for cables and venting.

• Internal: 15-7/16" L × 6-15/16" W × 9-3/4" H — fits up to 9-3/4" height.
• External: 18-7/8" L × 9-1/4" W × 10-1/4" H for cabinet and mounting space.
• Designed for Group 29 and Group 31 series battery footprints.

Who is this for? The Attwood 9084-1 is intended for boat owners, RV enthusiasts, and installers who need a rugged, code-compliant battery enclosure for larger batteries. If you require corrosion resistance, certified hold-down performance, and controlled ventilation in a marine or mobile application, this box streamlines installation and improves long-term battery security. It’s also a practical choice for OEM or aftermarket upgrades where durability and adherence to ABYC/USCG standards matter.