AGM-SlimLine 12 V 185 Ah battery

Mastervolt’s SlimLine range uses compressed AGM technology. This ultra-flat format delivers a volume and weight saving of around 15 % compared to traditional models, making it ideal for the tight compartments of boats.

This battery measures 560 x 126 x 280 mm (length x width x height, including terminals) and weighs 51.2 kg.

Yes, this is a dual-purpose battery. With its high-rate discharge capability and a cold cranking amps (CCA) rating of 930 A (SAE), it is ideal for starting large marine engines while also powering your onboard equipment continuously.

No, the AGM-SlimLine battery is fully maintenance-free. The electrolyte is absorbed in fiberglass separators; it must never be opened or topped up with water or acid.

Under normal use, this AGM battery does not emit any gas, allowing installation in enclosed spaces. However, in cases of extreme overcharging, the safety valves may release a small amount of gas; minimal ventilation remains a good practice.

Although AGM technology limits leakage risks, Mastervolt recommends installing the battery in an upright (vertical) position to ensure optimal performance and maximum safety.

The battery is fitted with M6 screw terminals. The recommended tightening torque to ensure good electrical contact is between 3.9 and 5.4 Nm.

Yes, it is essential to leave at least 1 cm of space between each battery to allow proper heat dissipation and prevent overheating of the bank.

You must use a battery charger with a 3-stage IUoUo charge curve. Recommended voltages at 25°C are 14.25 V for absorption (maximum 5 hours) and 13.80 V for floating.

No, mixing new and old batteries is strongly discouraged. For series or parallel wiring, all batteries must be of the same brand, model, capacity, and have the same age (state of charge).

The AGM-SlimLine 12/185Ah battery accepts a maximum charging current of 53 Amps. It is important to properly size your charger to avoid exceeding this value, which could damage the cells.

The operating temperature range is from -20°C to 55°C. However, the ideal nominal temperature is 25°C. Note that every 10°C increase above 25°C halves the battery's lifespan.

To maximize the lifespan of your AGM battery, avoid deep discharges. Ideally, do not exceed 50% depth of discharge from its nominal capacity of 185Ah.

Absolutely. With its ability to deliver very high currents over short durations (CCA 930 A), it is perfectly suited to power demanding equipment such as a bow thruster or an electric windlass.

Yes, using a temperature sensor connected to your charger is highly recommended. The ideal temperature compensation for this battery is -30mV/°C, which protects the battery from overcharging in hot weather.

Compressed AGM technology involves assembling lead plates and fiberglass separators in a much denser configuration. This delivers excellent electrical performance while reducing the battery’s physical footprint by 15%.

Yes, this is one of the main advantages of this format. Thanks to its ultra-flat specific dimensions, the footprint of two SlimLine 185Ah units matches exactly the space occupied by a single standard 200Ah AGM battery, allowing you to maximize energy storage in the same locker.

During winter storage or long-term storage, you must recharge the battery as soon as the open-circuit voltage (at rest) drops below 12.3 volts. Prolonged storage at low voltage will irreversibly damage the battery.

For safety reasons and to avoid any risk of short-circuit with your tools, always disconnect the negative (minus) cable first when removing the battery. Conversely, when installing, the negative cable should be connected last.