Yuasa Battery YUMICRON YUA00ACC05 - Manual (Page 38)

Dry Charged Battery plates that
have been subjected to the dry charg-
ing process.
Dry Charging Manufacturing
process in which tank-formed battery
plates are washed free of acid and
then dried.
Efficiency The ratio of the output of
a cell or battery to the input required
to restore the initial state of charge
under specified conditions of tempera-
ture, current rate and final voltage.
Electrode A conductor through
which current passes in or out of a cell.
Electrode (Electrolyte) Potential
The difference in potential between the
electrode and the immediately adja-
cent electrolyte, expressed in terms of
some standard electrode potential dif-
ference.
Electrolysis Electrochemical reac-
tion that causes the decomposition of a
compound.
Electrolyte Any substance that dis-
associates into two or more ions when
dissolved in water. Solutions of elec-
trolyte conduct electricity and are
decomposed by it. For batteries, elec-
trolyte implies a dilute solution of sulfu-
ric acid.
Electromotive Force (EMF)
Electrical pressure or potential,
expressed in volts.
Element An assembly of a positive
plate group, negative plate group and
separators.
End Gravity The specific gravity of
a cell at the end of a prescribed dis-
charge.
Energy Density Ratio of battery
energy content in watt hours to battery
weight in volume.
Envelope A separator folded and
wrapped around a battery plate dur-
ing assembly.
Equalizing Charge An extended
charge given to a storage battery to
ensure complete restoration of active
materials in all the plates of the cells.
Expander An ingredient in the neg-
ative paste that delays shrinking and
solidifying of the sponge lead of the
finished plate, thereby enhancing neg-
ative plate capacity.
Ferroresonant Charger A con-
stant volt power supply containing a
special transformer-capacitor combi-
nation that changes operating charac-
teristics as the draw is varied, ensuring
that voltage output remains constant.
Filling Gravity The specific gravity
of acid used to fill batteries.
Final Voltage The cut-off voltage of
a battery. The prescribed voltage
reached when the discharge is consid-
ered complete.
Finishing Rate The rate of charge,
in amperes, to which charging current
is reduced near the end of the charge
for some types of batteries to prevent
gassing and temperature rise.
Fixed Resistance Discharge
Discharge of a cell or battery through
a fixed resistive load, the current being
allowed to fall off as the terminal volt-
age decreases.
Float Plate A pasted plate.
Float Charging A recharge at a
very low rate, accomplished by con-
nection to a buss whose voltage is
slightly higher than the open circuit
voltage of the battery.
Foot Projections from the grid at the
bottom edge, used to support the plate
group.
Formation or Forming Charge
An initial charging process that elec-
trochemically converts the raw paste of
the plates into charged active material,
lead peroxide in the positive plates
and sponge lead in the negative
plates.
Formed Plates that have undergone
formation.
Freshening Charge A charge
given batteries in storage to replace
the standing loss and ensure that every
plate is periodically brought up to full
charge.
Full Charge Gravity Specific
gravity of the electrolyte when cells are
fully charged and properly leveled.
Gang Vent Vents for usually six
adjacent cells that are connected to a
common manifold.
Gassing Bubbles from gases being
released at one or more of the elec-
trodes during electrolysis.
Glass Mat Fabric made from glass
fibers with a polymeric binder such as
styrene or acrylic which is used to help
retain positive active material.
Gravity Specific gravity.
Gravity Drop The number of points
reduction or drop of specific gravity of
the electrolyte from cell discharge.
Grid A metallic framework used in a
battery for conducting electric current
and supporting the active material.
Group One or more plates of one
type – positive or negative – burned to
a post or strap.
H
2
SO
4
Sulfuric Acid.
High Rate On charge, any rate
higher than the normal finishing rate.
Hydration (Lead) Reaction
between water and lead or lead com-
pounds. Gravities lower than those
found in discharged cells are apt to
produce hydration, which appears as
a white coating on plate groups and
separators in a cell.
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GLOSSARY