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Major types of battery construction:
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Wet Cell (Flooded)
Wet or Flooded cell batteries are divided into low
maintenance (the most common) and maintenance
free (or sealed), which is based on their plate
formulation.
Low maintenance batteries have
lead-antimony/antimony or lead-antimony/calcium
(dual alloy or hybrid) plates thus the maintenance free
batteries use lead-calcium/calcium.
AGM
The Absorbed Glass Matt (AGM) are also sometimes
called "starved electrolyte" or "dry", because its
fiberglass mat is only 95% saturated with Sulfuric acid
and there is no excess liquid.
This construction allows the electrolyte to be
suspended in close proximity with the plate's active
material. In theory, this enhances both the discharge
and recharge efficiency.
Nearly all AGM batteries are sealed valve regulated
(commonly referred to as "VRLA" - Valve Regulated Lead-Acid).
Most valves regulated are under some pressure - 1 to 4 psi at sea
level.
Popular usages are high performance engine starting, power sports,
deep cycle, solar and storage battery.
GEL Cell
The Gel Cell is similar to the AGM style because the
electrolyte is suspended, but it is different because
technically the AGM battery is still considered to be a
wet cell. The electrolyte in a GEL cell has a silica
additive that causes it to set up or stiffen.
All Gel Cell batteries are sealed and a few are "valve
regulated", which means that a tiny valve keeps a
slight positive pressure.
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Battery Analyzer Series
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