MasterVolt 62000900 AGM Group Sealed Marine Battery Batteries - 12/90 31 12V 90Ah

The Mastervolt 62000900 AGM 12/90 is a Group 31, 12-volt, 90Ah Absorbed Glass Mat (AGM) sealed marine battery engineered for both starting and house/service applications. In AGM batteries, the electrolyte is absorbed into fiberglass mat separators, eliminating free liquid acid—making this battery completely maintenance-free with no gas emissions under normal use and no risk of acid spills or leaks.

Thanks to its construction, this battery delivers rapid, high-current discharge ideal for engine starting, bow thrusters, windlasses, and winches. During a starting event, the AGM 12/90 provides the same initial power surge as a 180Ah flooded lead-acid battery—at roughly half the capacity rating—making it a highly efficient upgrade from conventional wet-cell batteries. Its low 3% monthly self-discharge rate means it holds a strong charge during winter storage and off-season lay-up.

Key Features:

• Dual-Purpose Design: Serves as both a starter battery (high-current bursts) and a service/house battery (cyclical use for lighting, electronics, and instrumentation)
• AGM Technology: Fully sealed, spill-proof, and valve-regulated—can be installed in virtually any orientation (except inverted) including hard-to-reach spaces
• Superior Power Density: Delivers the same starting surge as a 180Ah flooded lead-acid battery
• Glass-Fibre Plate Technology: Ensures low internal resistance for efficient charge acceptance and discharge performance
• Thicker Plates: Extended service life compared to standard AGM designs
• Flexible Terminal System: Removable M8 battery poles are compatible with all standard battery terminal types, simplifying installation without additional wiring
• Maintenance-Free: No water additions, no venting requirements, no terminal corrosion from acid fumes
• Winter Storage Ready: Extremely low self-discharge rate keeps the battery in first-rate condition after extended storage
• Two-Year Warranty

Specifications:

• Nominal Voltage: 12V DC
• Nominal Capacity (C20): 90Ah
• Maximum Charge Current: 25.5A
• CCA (DIN): 360A
• CCA (SAE): 570A
• Battery Group: 31
• Terminals: M8 / A-type
• Dimensions (L x W x H, incl. handles): 13.0" x 6.8" x 8.7" (330 x 173 x 220 mm)
• Weight: 61.7 lbs (28 kg)

The Mastervolt AGM 12/90 is the ideal drop-in replacement for flooded lead-acid Group 31 batteries in marine, RV, and off-grid power systems where reliability, safety, and performance are paramount.