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For more information on hand tools refer to Use
When charging more than one battery at a time,
and Care of Hand Tools and Measuring Tools,
make sure that the voltage of the charging line
exceeds the total voltage of the batteries being
charged and that the charging rate, in amperes,
does not exceed the maximum charging rate of
the battery having the lowest ampere-hour
capacity in the line.
Lead-acid storage batteries are used as an
emergency power source for IC systems, such as
Lower the charging rate as soon as the battery
gyrocompasses and automatic telephone exchanges.
begins to gas or the temperature of the battery
Alkaline storage batteries are used in bus failure
reaches 125F (52C). If the battery is not
alarms and dry-cell batteries are used in various pieces
allowed to cool off, it will be permanently
of test equipment. You must be careful when you use
and maintain batteries, because of the electrical and
Keep the temperature of the battery compart-
chemical hazards involved. Chemical hazards include
ment below 96F (36C).
both the possibility of explosion and handling of
hazardous chemicals. As an IC Electrician, you will
Make no repairs to battery connections when
care for and maintain these batteries. NSTM, chapter
current is flowing. Never connect or disconnect
313, gives extensive coverage of battery care, tests,
batteries on the charging line without first turn-
and safety precautions.
ing off the charging current; death or severe
injury could result.
Lead-Acid Storage Batteries
When using tools around a battery, be careful
not to short-circuit the battery terminals.
Lead-acid storage batteries are rechargeable and,
Always pour acid slowly into water, and never
when cared for properly, will last for 4 or more years,
water into acid. Guard skin and eyes against
depending upon type and use. When a lead-acid
storage battery is not fit for further use, it must be
splashes of acid. Wear a rubber apron, rubber
surveyed and disposed of according to NSTM, chapter
boots, rubber gloves, chemical splashproof
593. The safety precautions for lead-acid storage
goggles, and a full-face shield.
batteries are as follows:
Exercise proper care when handling acid.
Keep flames and sparks of all kinds away from
Do not add acid of greater specific gravity than
the vicinity of storage batteries. A battery on
1.350 to a battery.
charge always gives off a certain amount of
hydrogen gas, which is extremely explosive.
Do not store sulphuric acid in places where
freezing temperatures are possible.
Be sure battery compartments that have been
sealed are well ventilated before entering the
Keep the electrolyte level above the tops of
compartment, turning on any lights, making or
breaking any electrical connections, or doing
Add only pure distilled water to a battery.
any work in the compartment.
Do not, except in an emergency, discharge the
You must ensure that the battery compartment
battery below the given low-voltage limit.
ventilation system is operating properly before
starting to charge batteries.
Never allow a battery to stand in a completely
discharged condition for more than 24 hours.
Stop the charge if ventilation is interrupted,
except in an emergency, and do not resume the
Do not operate the battery above 125F (52C).
charge until ventilation has been restored.
Avoid all sparks when removing or replacing
Charge a battery at the rate given on its name-
batteries located in compartments that may
contain gasoline vapors. Only tools with
insulated handles should be used. Where
Never charge a battery at a higher finishing rate
than that given on its nameplate.
batteries are used with one terminal grounded,

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