12 V AGM battery 270 Ah

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

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

Yes, absolutely. While it provides a massive 270 Ah energy reserve for house loads, its design 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.

Due to its waterproof design, it can theoretically be mounted in any position. However, the manufacturer strongly recommends installation in a vertical position (upright) for optimal performance and safety.

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

You must use a charger with a 3-stage IUoUo charging curve. Incomplete or unsuitable charging can irreparably 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 voltage settings must be as follows:

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

No, mixing old and new batteries is strongly discouraged. For series or parallel wiring, all batteries must be of the same brand, type, 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 attach eyelet terminals directly to the battery poles. It can also be combined with standard battery terminals.

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

To maximize the lifespan of your AGM battery, avoid regular deep discharges beyond 50 % of its rated capacity. Recharge it immediately after any 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.

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

Although the AGM battery does not release any gas during normal use, a charger fault (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 terminals remain clean and free of corrosion.

Yes, Mastervolt AGM batteries are supplied charged and are immediately ready for use once installed aboard.

Yes, thanks to thicker lead plates, this model is perfectly suited for moderate cyclic use (service battery bank) while maintaining excellent power for engine starts.

Mastervolt provides 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.