Gel Battery MVG 12 V 55 Ah

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

A 12V voltage and a 55Ah capacity.Strictly maintenance-free gel technology.No gas release 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, horizontal installation is also possible, provided it is not mounted on its shortest side. Its sealed design prevents any electrolyte leakage.

In normal use, Gel technology does not produce any gas emissions. You can therefore install this battery in confined spaces aboard without requiring rigorous ventilation, unlike classic lead-acid batteries.

You must use a battery charger with an IUoUo charging 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 voltage settings must 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 is 50% of its nominal 55Ah capacity. This allows for exceptionally fast recharging compared to standard marine market practices.

To preserve its lifespan, it is not recommended to perform regular discharges exceeding 60% of its nominal capacity. It is also imperative to fully recharge the battery completely and immediately after each discharge cycle.

Although primarily optimized for use as a service 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 coupled batteries must absolutely be of the same brand, same type, same 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 a space of at least 1 cm between each battery to allow adequate heat dissipation and prevent overheating.

The permitted 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 lifespan.

The battery is maintenance-free. Simply check the connections every three months to ensure they are tight and free of corrosion. Keep the battery housing clean and dry using only a soft, damp cloth—never use any chemicals or abrasives.

Yes, due to its extremely low self-discharge rate, it offers excellent performance during prolonged winter storage. 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 fitted with standard type A terminals. When installing, 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 the battery's overall lifespan.

If the voltage of a battery differs by more than +0.49 V or -0.24 V from the average float voltage, or if the surface temperature difference between 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 connection of battery terminals.

Repeated incomplete recharges can irreversibly damage the battery. It is essential to recharge it fully to 100% regularly, ideally at least once a week during cyclic use.