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Conclusions and



The low internal resistance of

AGM batteries makes them highly

suitable for powering winches,

windlasses and bowthrusters, for

starting engines, and for limited

cyclic use.


Gel batteries are highly suitable

as service batteries due to the fact

that they can be quickly charged

and have a long lifespan, even with

many charge/discharge cycles. For

a service battery you can choose

for either a 6-volt, 12-volt or 24-volt

version or the 2-volt model.


Lithium Ion batteries save up to

70 % in space and weight, last three

times longer and can be recharged

and discharged very quickly, 2000

charge cycles in normal use.


Mastervolt batteries are completely

maintenance-free and in normal

circumstances do not release

acid or generate dangerous gas.

They are easy to install anywhere

onboard, such as next to the bilge

or in the engine room (the latter

may lead to reduced lifespan due

to higher temperatures). Special

battery cases or external ventilation

are usually unnecessary as natural

ventilation will suffice.

Replacing traditional

lead-acid with Lithium Ion

The substantial benefits that Lithium Ion technology offer over lead-acid

technology means that using Lithium Ion batteries is becoming an ever

more popular choice.

When considering replacing an existing lead-acid battery bank by a Lithium Ion

battery bank one needs to take a couple of things into consideration. Although the

term ‘drop-in replacement’ is occasionally used in this case, it is actually never as

simple as that.

To get the most from the Lithium Ion batteries stay within the recommended

operating conditions. Although the batteries are set up to do this automatically and

safely, taking proper care of your new batteries will prevent nuisances during use

such as Lithium Ion batteries disengaging themselves (by a safety relay). Things to

take into consideration are:


The charge voltage of the battery bank needs to be checked and possibly changed.

Where low charge voltage will result in incompletely charged batteries, overly high

charge voltage will potentially push the Lithium Ion batteries outside their allowed

operating conditions.


Battery monitoring needs to be shunt (Ah counting) based, not voltage based.

Some basic battery monitoring products base the battery status fully on voltage

measurement. In case of Lithium Ion batteries this will result in unreliable

readings, potentially leading to deep discharges. Only shunt-based monitoring

devices that incorporate a Lithium Ion battery type setting should be used.

The MLI Ultra series has an external safety relay (battery disconnect switch) and

integrated battery monitoring, requiring proper installation and commissioning by a

qualified installer. Setting this up correctly, including alarms and events through the

MasterBus network, results in a safe and intuitive user interface.

The MLS products have an integrated safety relay. This results in a Lithium Ion

battery that is as close as possible to a ‘drop-in replacement’ for lead-acid, as long as

the above considerations are kept in mind.

MLI & MLS series

preferable settings

12 V

24 V

Bulk/Absorption voltage

14.25 V

28.5 V

Float voltage

13.5 V

27 V