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Universal Size Compatibility: Contains removable spacer blocks to securely accommodate Group 24, 27, and 31 batteries. Interior dimensions are 13.1 x 7 x 11 inches for a tight fit. Securely holds standard marine and RV batteries up to 9.3 inches in height. Advanced Safety Ventilation: Designed with upward-facing vents that expel hazardous gases while cutting water intake by up to 94% compared to standard battery boxes. Acid-Resistant Construction: Durable polypropylene material is impact-tested from -20°F to +120°F to deliver safe, reliable performance in extreme marine or outdoor environments. Quick-Access Entry Panels: Features innovative folding panels that enable you to reach battery terminals for maintenance without detaching the robust mounting strap. Secure Portable Design: Fitted with reinforced mounting hardware and ergonomic handles to provide safe, stable transport and simple installation in any marine or mobile application. Certified Safe & Compliant: Conforms to USCG 183.420 regulations for original equipment manufacturer (OEM) installed battery hold-down systems