MVG gel battery 12 V 55 Ah

The Mastervolt MVG gel 12V/55Ah battery is a high-performance sealed service battery. Its main characteristics include:

A voltage of 12V and a capacity of 55Ah.A strictly maintenance-free Gel technology.No gas emission during normal use.Excellent resistance to intensive charge and discharge cycles.

This Mastervolt battery weighs 19 kg. Its overall dimensions, including terminals and transport handles, are 261 x 136 x 230 mm (Length x Width x Height).

No, never open the battery or add acid or distilled water. Thanks to its technology where the electrolyte is fully absorbed in gel form, it is maintenance-free. The pressure valves are sealed and opening them would destroy the battery.

It is recommended to install it in a vertical position (upright). However, a horizontal installation is also possible, provided it is not mounted on its shortest side. Its sealed design prevents any electrolyte leakage.

Under normal use, Gel technology produces no gas emissions. You can therefore install this battery in confined spaces on board without requiring rigorous ventilation, unlike classic lead-acid batteries.

You must use a battery charger with an IUoUo charge characteristic. It is also highly recommended to use a charger equipped with a temperature compensation probe (-30mV/°C) to optimize the lifespan of your battery bank.

At a reference ambient temperature of 25°C, your charger’s voltage settings should be as follows:

Absorption voltage: 14.25 V (for a maximum of 5 hours). Float voltage: 13.80 V.

The battery accepts a maximum charging current of 27.5 A, which corresponds to 50% of its nominal capacity of 55Ah. This allows for exceptionally fast charging compared to standard marine market practices.

To preserve battery lifespan, avoid regular discharges exceeding 60% of its nominal capacity. It is also essential to fully recharge the battery immediately after each discharge cycle.

Although it is primarily optimized to serve as a house battery (powering onboard equipment), it delivers a cold cranking amperage (CCA) of 380 A (SAE standard) or 230 A (DIN standard). It can therefore occasionally assist with engine starting, but this is not its primary function.

Yes, you can connect them in series or parallel to increase the voltage or overall capacity of your bank. However, all batteries must be of the same brand, type, capacity, and have the same initial charge level. Never mix new batteries with old ones.

When installing multiple units side by side, it is essential to maintain at least 1 cm of space between each battery to allow proper heat dissipation and prevent overheating.

The allowed operating temperature range is between -20°C and 45°C. However, the recommended nominal temperature is 20°C. Note that every 10°C increase above this reference temperature halves the battery's lifespan.

The battery requires no internal maintenance. Simply check the connections every three months to ensure they are tight and free of corrosion. Keep the battery case clean and dry using only a soft, damp cloth—no chemicals or abrasives.

Yes, thanks to its extremely low self-discharge rate, it provides excellent performance during extended winter storage periods. It is still recommended to store it fully charged and to check its voltage periodically (recharge if it drops below 12.3 V).

The battery is equipped with standard A-type terminals. During installation, it is advisable to use properly sized cable lugs, tighten connections firmly, and add insulating caps to prevent accidental short circuits.

No, it is strongly recommended to keep the battery away from any heat source, including the engine block. High ambient temperature accelerates self-discharge and significantly reduces overall battery lifespan.

If the voltage of one battery differs by more than +0.49 V or -0.24 V from the average float voltage, or if the surface temperature difference between the batteries exceeds 5°C, there is a malfunction. It is recommended to have a qualified technician inspect your installation.

Yes, for obvious electrical safety reasons, all loads (equipment) and chargers must be turned off during handling, installation, and battery terminal connection.

Repeated incomplete charges can irreversibly damage the battery. It is imperative to fully recharge it to 100% of its capacity regularly, ideally at least once a week for cyclic use.