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4 Glossary
What is an AGM battery?
An AGM battery is a lead-acid electric storage battery that:
• is sealed using special pressure valves and should
never be opened.
• is completely maintenance-free.*
• has all of its electrolyte absorbed in separators con-
sisting of a sponge-like mass of matted glass fibers.
• uses a recombination reaction to prevent the
escape 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 instal-
lation is not recommended.
Connections must be retorqued and the batteries
should be cleaned periodically.
What is a VRLA battery?
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 that opens when a preset
pressure is realized inside the battery and let’s the
excess gas pressure out. 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 con-
trolled electrical system. Those SLI batteries which are
intended for heavy haulage vehicles fitted with large
diesel motors may often be called COMMERCIAL bat-
teries. They have to be much more powerful and more
robust than batteries intended for cars.
What is STATE OF HEALTH?
It means how much battery capacity is left (%) com-
paring with the marked original battery capacity.
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