Mastervolt 62002700 AGM 12/270 Group Super 8D 270Ah Sealed Marine Battery

The Mastervolt AGM 12/270 (Group Super 8D) is a heavy-duty, 12-volt, 270Ah sealed AGM marine battery engineered to serve as both a high-output starter battery and a reliable house/service battery. Its dual-purpose design makes it an ideal all-in-one power solution for marine, RV, and off-grid applications where dependability and safety are paramount.

In AGM (Absorbed Glass Mat) batteries, the electrolyte—a mixture of water and sulphuric acid—is fully absorbed into layers of glass-fiber matting. This construction eliminates free liquid inside the case, making the battery completely spill-proof and safe to install in virtually any orientation or location aboard a vessel, including enclosed compartments. There is no off-gassing under normal operating conditions, removing the need for dedicated battery ventilation.

Key Features:

• Dual-Purpose Performance: Delivers short, high-current bursts for engine starting, bow thrusters, and winches, while also tolerating medium cyclical discharge for lighting, instrumentation, and onboard electronics
• 270Ah Capacity (C20): Rated at 270 amp-hours over a 20-hour discharge rate to 10.5V — substantial reserve capacity for extended use
• High Cold Cranking Amps: 1,200A CCA (SAE) / 750A CCA (DIN) for reliable engine starts in all conditions
• Glass-Fiber Technology: Fiberglass matting ensures low internal resistance for efficient power delivery and faster recharge
• Thicker Plates: Reinforced plate construction extends overall battery lifespan compared to standard lead-acid designs
• Maintenance-Free: No water addition required; entirely sealed and valve-regulated to prevent acid leaks and terminal corrosion
• Low Self-Discharge: Approximately 3% monthly self-discharge rate keeps the battery ready even after extended storage
• Flexible Terminal Configuration: M8 removable terminal posts are compatible with all standard battery terminals, simplifying installation and cable routing
• Superior Upgrade Path: Provides equivalent starting power to a much larger flooded lead-acid battery — an AGM 12/90Ah delivers the same initial surge as a 180Ah flooded unit
• Group Super 8D Form Factor: Industry-standard sizing for straightforward replacement of conventional Group 8D batteries
• Two-Year Warranty

Specifications:

• Voltage: 12V DC
• Capacity (C20): 270Ah
• Max Charge Current: 76.5A
• CCA (SAE): 1,200A
• CCA (DIN): 750A
• Battery Terminals: M8 / A-type
• Dimensions (L x W x H, incl. handles): 20.6" x 10.6" x 8.9"
• Weight: 161 lbs (73 kg)

The Mastervolt AGM 12/270 is a premium drop-in replacement for flooded lead-acid Group 8D batteries, combining the safety and convenience of sealed AGM technology with the high power output demanded by serious marine and commercial applications.