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 with traditional models, making it ideal for cramped boat engine compartments.

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 discharge capacity and cold cranking amps (CCA) of 930 A (SAE), it is ideal for starting large marine engines while continuously powering your onboard equipment.

No, the AGM-SlimLine battery is fully maintenance-free. The electrolyte is absorbed in fiberglass separators; you never need to open it or add water or acid.

In normal use, this AGM battery does not release any gas, allowing it to be installed in confined spaces. However, in cases of extreme overcharging, the safety valves may release a small amount of gas; minimal ventilation remains good practice.

While AGM technology minimizes leak risks, Mastervolt recommends installing the battery in an upright 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, a space of at least 1 cm must be left between each battery to allow proper heat dissipation and prevent overheating of the battery bank.

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

No, it is strongly discouraged to mix new and old batteries. For a series or parallel connection, all batteries must be of the same brand, same model, same 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 correctly size your charger to avoid exceeding this value, as doing so may damage the cells.

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 lifespan.

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

Absolutely. Thanks to its ability to deliver very high currents for 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 against overcharging in hot weather.

AGM compressed technology involves assembling lead plates and glass-fiber 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 major advantages of this format. Thanks to its specific ultra-flat dimensions, the footprint of two SlimLine 185 Ah units matches exactly the space occupied by a single standard 200 Ah AGM battery, allowing you to maximize available energy in the same locker.

During winter storage or layup, 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 cable (minus) first when removing the battery. Conversely, when installing, the negative cable must be connected last.