Würth 0772 800 Operating Instructions Manual page 18

Glossary
What is a GEL battery
A gel battery is a lead-acid electric storage battery
that:
— is sealed using special pressure valves and
should never be opened.
— is completely maintenance-free.
— uses thixotropic gelled electrolyte.
— uses a recombination reaction to prevent the es-
cape of hydrogen and oxygen gases normally
lost in a flooded lead-acid battery (particularly in
deep cycle applications).
— is non-spillable, and therefore can be operated
in virtually any position. However, upside-down
installation is not recommended.
Connections must be retorqued and the batteries be
cleaned periodically.
What is an AGM battery?
An AGM battery is a lead-acid electric storage bat-
tery that:
— is sealed using special pressure valves and
should never be opened.
— is completely maintenance-free.
— has all of its electrolyte absorbed in separators
consisting of a sponge-like mass of matted glass
fibers.
— uses a recombination reaction to prevent the es-
cape of hydrogen and oxygen gases normally
lost in a flooded lead-acid battery (particularly in
deep cycle applications).
— is non-spillable, and therefore can be operated
in virtually any position. However, upside-down
installation is not recommended.
Connections must be retorqued and the batteries be
cleaned periodically.
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What is a VRLA battery?
A valve Regulated Lead Acid Battery. This type of bat-
tery is sealed maintenance-free with a "Bunce" valve
or valves in the top of them which opens when a pre-
set pressure is realized inside the battery and allows
the gas pressure to be relieved. Then the valve resets
itself.
What is a SLI battery?
These initials stand for Starting, Lighting and Ignition,
which are the three basic functions which a battery
has to perform on all normal vehicles. Batteries given
this description will have been specifically designed
for service on cars and trucks within a voltage control-
led electrical system. Those SLI batteries which are
intended for heavy haulage vehicles fitted with large
diesel motors are often be called commercial batter-
ies. They have to be much more powerful and more
robust than batteries intended for cars.
What is state of health?
It stands for how much battery capacity is left (%)
comparing with the marked original battery capacity.
What is state of charge?
It shows to what an extend the battery capacity is
actually charged (in %).
What does CCA mean?
The current in amperes which a new and fully charged
battery can deliver for 30 seconds continuously with-
out the terminal voltage falling below 1.2 volts per
cell, after it has been cooled to ‒17.8°C and held
at that temperature. This rating reflects the ability of
the battery to deliver engine starting currents under
winter conditions.
What does ampere hour mean?
This is the measuring unit for electrical capacity. A
current of one ampere for one hour implies the deliv-
ery or receipt of one ampere‒hour of electricity. Cur-
rent multiplied by time in hours equals ampere‒hours.