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The semi-traction battery

A semi-traction battery has fewer but

thicker plates in each cell. These batteries

supply a relatively lower starter current,

but can be discharged more often and to

a greater extent (200 to 600 full cycles).

This kind of battery is highly appropriate

for the combined function of starter and

service battery.

This type of battery has even fewer, but

very thick, flat or cylindrical plates. It can

therefore be discharged many times and

fairly completely (1000-1500 full cycles).

This is why flooded traction batteries are

often used in forklifts and small electrical

equipment such as industrial-grade

cleaning machines.

But flooded traction batteries require

a special charge method. Because

these batteries are mostly tall, they

are sensitive to the accumulation of

sulphuric acid at the bottom of the

battery container. This phenomenon is

called stratification and occurs because

sulphuric acid is denser than water.

Acid content increases in the lower part

of the battery, locally intensifying plate

corrosion, and decreases in the upper

part, reducing capacity.

The battery is discharged unevenly,

significantly reducing its lifespan.

In order to spread out the acid

evenly again, the battery has to

be purposefully overloaded using

excessive voltage. This generates

a large amount of hydrogen gas,

which will form a dangerous

mixture with oxygen in the air.

The voltage required to recharge

these batteries is around 2.7 volt

per cell, or 16.2 volt for a 12 V

system and 32.4 volt for a 24 V

system. These high levels of voltage

are extremely dangerous for the

connected equipment and the large

amount of gas generated makes

these batteries unsuitable for use

in vessels and vehicles, except for


The Lithium Ion battery

Until recently, Lithium Ion batteries were

mainly available as chargeable batteries

with a small capacity, which made

them popular for use in mobile phones

and laptops. Mastervolt offers Lithium

Ion batteries with large capacities.

Our Lithium Ion batteries have a high

energy density and are perfect for cyclic

applications. Compared to traditional

lead-acid batteries, Lithium Ion batteries

offer savings of up to 70 % in volume and

weight, while the number of charging

cycles is three times higher than semi-

traction lead-acid batteries. An added

benefit is that Lithium Ion batteries can

supply a constant capacity, regardless of

the connected load.

resulting in a very short charging time

and no memory effect.

Battery Management System

Mastervolt Lithium Ion batteries are

equipped with a Battery Management

System. The system keeps all the

individual cells perfectly balanced,

resulting in a higher capacity and longer


The flooded traction battery

(Mastervolt does not have this type of batteries in its portfolio)

The available capacity of a lead-acid

battery is reduced in case of higher

discharge currents. Lithium Ion batteries

can be discharged to 80 % without

affecting their lifespan, whereas lead-

acid batteries are more affected by deep


Lasts longer

Compared to traditional open or lead

acid batteries, the Lithium Ion batteries

offer even more benefits, such as a

much larger power density and a longer


And because lithium is the lightest metal,

Lithium Ion batteries are also more

lightweight. They can also be charged

at any time, while nickel-cadmium

batteries require complete discharge for

an optimal performance and to prevent

memory effect. Furthermore, Lithium

Ion batteries can be charged with a very

high current, up to 100 % of the capacity,