Yuasa Battery YUMICRON YUA00ACC05 - Manual (Page 39)

Hydrometer A device used to mea-
sure density or specific gravity of elec-
trolyte solutions.
Hydroset Curing process for plates
that oxidizes the lead paste, reducing
free lead to a few percent of total.
Initial Voltage The closed circuit
voltage at the beginning of a dis-
charge. It is usually measured after
current has flowed for a period suffi-
cient for the voltage rate of change to
become practically constant.
Insert A bushing of lead or lead alloy
molded or sealed into cell covers, and
to which the post is burned to create a
creep-resistant, cover-to-post seal.
Intercell Connector Conductor of
lead or lead alloy used to connect two
battery cells.
Internal Resistance Resistance
within a cell or battery to the flow of
electric current, measured by the ratio
of the change in voltage to a specified
change in current for a short period of
time.
Jar Housing, or container, for one or
more cells.
Jar Formation Forming of plates in
the cell jar.
Jumper A short length of conductor
used to connect or cut out part of an
electrical circuit.
Kilovolt One thousand volts.
Kilowatt One thousand watts.
Kilowatt Hours A measure of ener-
gy or work accomplished, being 1000
watt hours.
Lead (Pb) Chemical element used in
lead acid batteries.
Lead Burning Welding of lead or
alloy parts.
Lead Hydrate A white lead com-
pound formed by reaction of very
dilute electrolyte or water and metallic
lead or lead alloys.
Lead Oxide A general term for any
of the lead oxides used to produce bat-
teries.
Lead Peroxide A brown lead oxide
which is the positive material in a fully
formed positive plate.
Lead Plated Part Hardware that
has a thin protective layer of lead elec-
trode deposited on the surface.
Lead Sponge The chief component
of the active material of a fully-charged
negative plate.
Lead Sulfate A compound that
results from the chemical action of sul-
furic acid on oxides of lead or on
lead metal.
Level Lines Horizontal lines molded
or painted near tops of battery contain-
ers indicating maximum and minimum
electrolyte levels.
Litharge A yellow-red oxide of lead
sometimes used in making active
material.
Local Action A battery’s loss of oth-
erwise usable chemical energy by cur-
rents that flow within the cell of a bat-
tery regardless of its connection to an
external circuit.
Loss of Charge Capacity loss in a
cell or battery standing on open circuit
as a result of local action.
Lug A portion of the grid used for sup-
port of the plate group, usually a hang-
ing lug on the top edge of the grid.
Also, a tab on the grid used for connec-
tion of plate to strap and other plates.
Machine Casting A fully or semi-
automatic grid or small parts casting
operation.
MF (Maintenance Free Battery) A
VRLA sealed absorbed glass mat
(AGM) battery.
Manual Discharge Capacity test
in which the operator disconnects the
battery from the test load after all cells
have reached the prescribed final volt-
age. With fixed resistance loads,
boost cells are used to keep the dis-
charge rate fairly constant as the test
cell voltages drop rapidly near the
final voltage. Electronic load manual
discharges generally do not require
boost cells.
Microporous Separator A
veneer or grooved-type separator
made of any material that has many
microscopically small pores.
Milliampere One thousandth of
an ampere.
Millivolt One thousandth of a volt.
Modified Constant Voltage
Charge
A charge in which charging
current voltage is held substantially
constant while a fixed resistance is
inserted in the battery circuit, produc-
ing a rising voltage characteristic at
the battery terminals as the charge
progresses.
Mold A cast iron or steel form used
to produce a casting of definite shape
or outline.
Mold Coat A spray applied to
metal molds that acts as a release
agent and an insulator against rapid
heat transfer.
Moss Lead crystals that can grow at
high current density areas of negative
plates— along edges, at feet or at
plate lugs— and cause short circuiting.
Negative Plate The grid and active
material that current flows to from the
external circuit when a battery is dis-
charging.
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GLOSSARY