12 V AGM battery 270 Ah

AGM (Absorbent Glass Mat) technology traps the electrolyte entirely. This means the battery is fully sealed, maintenance-free, and releases no gas during normal use. It also has very low internal resistance, ideal for rapid high-current discharges.

This battery is in the Super 8D format. Its external dimensions (including handles) are 522 x 268 x 226 mm and it weighs 73 kg. Due to its significant weight, the use of appropriate handling equipment is recommended during installation.

Yes, absolutely. While it provides a massive 270 Ah energy reserve for house loads, its design also delivers excellent starting performance. It can deliver a cold cranking amperage (CCA) of 1200 A (SAE) or 750 A (DIN).

No, this battery is 100% maintenance-free. Never open it or add acid or distilled water. Simply keep it clean with a damp cloth and check the terminal tightness regularly.

Thanks to its watertight design, it can theoretically be mounted in any position. However, the manufacturer strongly recommends installing it in an upright (vertical) position for optimal performance and safety.

When installing a battery bank, it is essential to leave a gap of at least 1 cm between each battery to allow for adequate heat dissipation.

You must use a charger with a 3-stage IUoUo charging curve. Incomplete or unsuitable chargers can irreversibly damage the battery.

The maximum recommended charging current for this Mastervolt AGM 12/270Ah battery is 76.5 A.

At a reference temperature of 25°C, the following voltage settings must be applied:

Absorption voltage: 14.25 V (for a maximum of 5 hours)
Float voltage (maintenance): 13.80 V
A temperature compensation of -30 mV/°C is highly recommended.

No, it is strongly discouraged to mix old and new batteries. For a series or parallel connection, all batteries must be of the same brand, same type, same capacity, and have the same state of charge.

The battery is fitted with M8 screw-type terminals (type A). For optimal connection, it is recommended to directly attach eyelet terminals to the battery poles. It can also be combined with standard battery terminals.

To ensure a perfect electrical contact and avoid any overheating, screw connections must be tightened to a torque between 14.7 and 19.6 Nm.

To maximize the lifespan of your AGM battery, it is recommended to avoid regular deep discharges beyond 50% of its rated capacity. It should also be recharged immediately after each significant discharge.

An open-circuit voltage below 12.3 V indicates that the battery is deeply discharged. You must recharge it to 100 % immediately to prevent sulfation and irreversible damage to the lead plates.

Operating temperature range is between -20°C and 55°C, with a recommended nominal temperature of 25°C. Note that every 10°C increase above 25°C halves the battery lifespan, while lower temperatures reduce available capacity.

Although AGM batteries do not release any gas during normal use, a charger malfunction (overcharging) can cause the release of an explosive mixture of hydrogen gas. It is therefore essential to ensure adequate ventilation of the storage compartment.

Use only a soft, damp cloth to clean the housing. Never use solvents, additives, acids, or abrasive products. Ensure the terminals remain clean and free of corrosion.

Yes, Mastervolt AGM batteries are delivered charged and are immediately ready for use upon installation on board.

Yes, thanks to the use of thicker lead plates, this model is perfectly suited for average cyclic use (service fleet) while maintaining excellent power for engine starts.

Mastervolt offers a two-year warranty on this AGM 12/270Ah battery model, provided it is installed and used in accordance with the technical manual’s recommendations.