OPERATOR’S MANUAL / MANUAL DEL USUARIO

6V/12V Battery Charger/Maintainer

Cargador de baterías 6V y 12V/Mantenedor

Model / Modelo
28.71239

CAUTION: ATENCIÓN:
Read and follow all safety Lea y siga todas las reglas
rules and operating instructions de seguridad e instrucciones de uso
before every use of this product. antes de cada uso de este producto.
SAVE THESE INSTRUCTIONS. GUARDE ESTAS INSTRUCCIONES.

Sears Brands Management Corporation,

Hoffman Estates, IL 60179 U.S.A.
0099001367-02

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 DIEHARD® THREE-YEAR FULL WARRANTY
When operated and maintained according to all supplied instructions,
if this DieHard® product fails due to a defect in material or workman-
ship within 3 years from the date of purchase, return it to any DieHard®
outlet in the United States for free replacement.
This warranty gives you specific legal rights, and you may also have
other rights which vary from state to state.
Sears Brands Management Corporation, Hoffman Estates, IL 60179
FOR CUSTOMER ASSISTANCE OR REPLACEMENT PARTS,
CALL 1-800-SEARS-64 (1-800-732-7764) TOLL-FREE
FROM 7 AM TO 5 PM CT.

DIEHARD® TRES AÑOS DE GARANTÍA TOTAL

Cuando se opere o maneje con las debidas precauciones de acuerdo
a las instrucciones, si el DieHard® falla en alguno de sus componentes
de fabricación durante los 3 años contados a partir de la fecha de com-
pra, regresarlo al autoservicio DieHard® en los estados unidos para
reemplazar el aparato sin costo alguno.
Esta garantía le otorga derechos legales específicos, así como otros
derechos, que varían de estado a estado.
Sears Brands Management Corporation, Hoffman Estates, IL 60179
PARA ASISTENCIA AL CLIENTE O REPUESTOS,
LLAME GRATIS AL 7 AM-5 PM CT
LUNES A VIERNES: 1-800-SEARS-64 (1-800-732-7764)

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 CONTENTS
IMPORTANT SAFETY INSTRUCTIONS......................................................4
PERSONAL SAFETY PRECAUTIONS.........................................................5
GROUNDING AND AC POWER CORD CONNECTIONS ...........................6
ASSEMBLY INSTRUCTIONS.......................................................................6
FEATURES...................................................................................................6
CONTROL PANEL........................................................................................7
OPERATING INSTRUCTIONS.....................................................................7
DISPLAY MESSAGES................................................................................ 11
MAINTENANCE AND CARE....................................................................... 11
TROUBLESHOOTING................................................................................12
BEFORE RETURNING FOR REPAIRS......................................................13

CONTENIDOS
INSTRUCCIONES IMPORTANTES DE SEGURIDAD...............................14
PRECAUCIONES DE SEGURIDAD PERSONAL.......................................15
CONEXIONES A TIERRA Y ENERGÍA DE CA...........................................16
INSTRUCCIONES DE MONTAJE..............................................................16
CARACTERÍSTICAS..................................................................................17
PANEL DE CONTROL................................................................................17
INSTRUCCIONES DE OPERACIÓN..........................................................18
MUESTRA DE MENSAJES........................................................................22
MANTENIMIENTO Y CUIDADO.................................................................22
LOCALIZACIÓN Y SOLUCIÓN DE PROBLEMAS.....................................23
ANTES DE DEVOLVER A REPARACIONES..............................................24

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 IMPORTANT SAFETY INSTRUCTIONS
WARNING – RISK OF EXPLOSIVE GASES

WORKING IN THE VICINITY OF A LEAD-ACID BATTERY IS DANGEROUS.

BATTERIES GENERATE EXPLOSIVE GASES DURING NORMAL OPERATION.
FOR THIS REASON, IT IS IMPORTANT THAT YOU FOLLOW THESE
INSTRUCTIONS EACH TIME YOU USE THE CHARGER.

To reduce the risk of a battery explosion, follow these instructions and

those published by the manufacturer of the battery and any equipment
you intend to use in the vicinity of the battery. Review the cautionary
markings on these products and on the engine.
WARNING: Pursuant to California Proposition 65, this product contains chemicals
known to the state of California to cause cancer and birth defects or other
reproductive harm. Wash hands after handling.
• Keep out of reach of children.
• Use the battery charger on 6 and 12V LEAD-ACID, GEL and AGM-type
rechargeable batteries rechargeable batteries with recommended rated capacities
of 12Ah (6V) and 12-59Ah (12V), as used in automobiles, trucks, tractors,
airplanes, vans, RVs, trolling motors, etc. This charger is not intended to supply
power to low-voltage electrical systems, other than in a motor-starting application.
WARNING: Do not use battery charger with dry cell batteries that are
commonly used with home appliances. These batteries may burst and cause
injury or damage to property.
• Use only attachments recommended or sold by the battery charger’s
manufacturer. Use of non-recommended attachments may result in a fire,
electric shock, or injury.
• Locate the battery charger’s power cord so it cannot be stepped on, tripped
over, or subjected to damage or stress.
• Do not operate the charger if it has received a sharp blow, been dropped,
or otherwise damaged in any way. Take it to a qualified professional for
inspection and repair.
• Do not disassemble the charger. Take it to a qualified professional when
service or repair is required.
• To reduce the risk of electric shock, unplug the charger from the outlet before
attempting any maintenance or cleaning.
• Do not use an extension cord.
• Always charge the battery in a well-ventilated area.

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 • Do not set the charger on flammable materials, such as carpeting, upholstery,
paper, cardboard, etc.
• Never smoke or allow sparks or flames in the vicinity of the battery or engine.
WARNING: RISK OF EXPLOSIVE GAS.
• Operate the charger as far away from the battery as DC charger cables permit.
• Do not expose the charger to rain or snow.
• NEVER charge a frozen battery.
• NEVER overcharge a battery.
• NEVER set a battery on top of the charger.
• NEVER place the charger directly above a battery being charged. Gases from
the battery will corrode and damage the charger.
• NEVER touch the battery clips together when the charger is energized.
• When disconnecting the battery charger, pull by the plug, not by the cord. Pulling
on the cord may cause damage to the cord or plug.
• Do not operate the charger with damaged cord or plug.
• NEVER allow battery acid to drip onto the charger.

PERSONAL SAFETY PRECAUTIONS

• Wear complete eye protection and protective clothing when working near
lead-acid batteries. Always have someone nearby for help.
• Have plenty of fresh water, soap and baking soda nearby for use, in case
battery acid contacts your eyes, skin, or clothing. Wash immediately with soap
and water and seek medical attention.
• If battery acid comes in contact with eyes, flush eyes immediately for a
minimum 10 minutes and get medical attention.
• Neutralize any acid spills thoroughly with baking soda before attempting to
clean up.
• Remove all personal metal items from your body, such as rings, bracelets,
necklaces and watches. A battery can produce a short circuit current high
enough to weld a ring to metal, causing a severe burn.
• Do not drop a metal tool onto the battery.
• If it is necessary to remove the battery from the vehicle to charge it, always
remove the grounded terminal first.

•5•
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 GROUNDING AND AC POWER CORD CONNECTIONS
This battery charger is for use on a nominal 120 volt circuit. The plug must be
plugged into an outlet that is properly installed and grounded in accordance with
all local codes and ordinances. The plug pins must fit the receptacle (outlet). Do
not use with an ungrounded system. NOTE: Pursuant to Canadian Regulations,
use of an adapter plug is not allowed in Canada. Use of an adapter plug in the
United States is not recommended and should not be used.
USING AN EXTENSION CORD
The use of an extension cord is not recommended. If you must use an
extension cord, follow these guidelines:
• Pins on plug of extension cord must be the same number, size, and shape as
those of plug on charger.
• Ensure that the extension cord is properly wired and in good electrical condition.
• Wire size must be large enough for the AC ampere rating of the charger, as
specified below:
Length of cord (feet): 25 50 100 150
AWG* size of cord: 18 18 16 14
*AWG-American Wire Gauge
ASSEMBLY INSTRUCTIONS
Remove all cord wraps and uncoil the cables prior to using the battery charger.
FEATURES
2 3 4 5
1. AC Power cord
1
2. Digital display
3. Display/ON button
4. Charging/Charged/Maintaining
LED indicator
5. Hook attachment
6. Ring terminal quick-connect
6
7. Battery clamp quick-connect
8. 12V accessory plug
7
quick-connect
8

•6•
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 CONTROL PANEL
DIGITAL DISPLAY
The digital display indicates the status of the battery and charger. See the
troubleshooting section for a complete list of messages.
NOTE: During charging, the display will go into sleep mode and will not
display any messages. To turn the display back on, press the display button.
DISPLAY/ON BUTTON
The digital display will show the battery’s voltage and percentage of charge.
Press the display button to show the charge progress.
LED DISPLAY
GREEN LED solid (CHARGING): The charger is charging the battery.
GREEN LED pulsing (CHARGED/MAINTAINING): The battery is fully
charged and the charger is in maintain mode.
GREEN LED flashing: The charge has aborted (see Aborted Charge section).
OPERATING INSTRUCTIONS
IMPORTANT: Do not start the vehicle with the charger connected to the AC
outlet, or it may damage the charger and your vehicle.
NOTE: This charger is equipped with an auto-start feature. Current will not
be supplied to the battery clamps until a battery is properly connected. The
clamps will not spark if touched together.
CHARGING A BATTERY IN THE VEHICLE
1. Turn off all the vehicle’s accessories.
2. Keep the hood open.
3. Clean the battery terminals.
4. Place the charger on a dry, non-flammable surface, or use the convenient
hook attachment to hang the unit safely outside the work area.
5. Lay the AC/DC cables away from any fan blades, belts, pulleys and other
moving parts.
6. For a negative-ground vehicle (as in most vehicles), connect the
charger’s POSITIVE (RED) clamp to the POSITIVE (POS, P, +) battery
post. Next, connect the charger’s NEGATIVE (BLACK) clamp to the
vehicle chassis or engine block, away from the battery.
7. For a positive-ground vehicle, connect the charger’s NEGATIVE (BLACK)
clamp to the NEGATIVE (NEG, N, -) battery post. Next, connect the
charger’s POSITIVE (RED) clamp to the vehicle chassis or engine block
away from the battery. NEVER connect any clamps to the carburetor, fuel
lines or sheet-metal body parts.
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 8. Connect the charger to an electrical outlet.
9. When the charger starts, the GREEN LED will be solid, and the display
will show ANALYZING BATTERY while the charger determines that the
battery is properly connected, the condition of the battery, and whether
the battery is 6V or 12V.
10. Monitor the progress of the charge by pressing the display button on the front
of the unit. When the battery is fully charged, the GREEN LED will pulse.
11. When charging is complete, disconnect the charger from the AC power,
remove the clamps from the vehicle’s chassis, and then remove the clamp
from the battery terminal.
CHARGING A BATTERY OUTSIDE OF THE VEHICLE
1. Place battery in a well-ventilated area.
2. Clean the battery terminals.
3. Connect a 24-inch long, 6-gauge (AWG) insulated battery cable to the
NEGATIVE (NEG, N, -) battery post (i.e., jumper cable) (not provided).
4. Connect the POSITIVE (RED) clamp to the POSITIVE (POS, P, +)
battery post.
5. Position yourself and the “negative post extension” cable as far away
from the battery as possible, and connect the NEGATIVE (BLACK) clamp
to the cable’s free end.
6. Connect the charger to the electrical outlet.
7. When the charger starts, the GREEN LED will be solid, and the display
will show ANALYZING BATTERY while the charger determines if the
battery is properly connected, the condition of the battery, and whether
the battery is 6V or 12V.
8. Monitor the progress of the charge by pressing the display button on
the front of the unit. When the battery is fully charged, the GREEN LED
will pulse.
9. When charging is complete, disconnect the charger from the AC power,
disconnect the negative clamp, and finally the positive clamp.
10. A marine (boat) battery must be removed and charged on shore.
USING THE QUICK-CONNECT CABLE CONNECTORS
Connect any of the three output cable assemblies to the charger in a matter
of seconds.
IMPORTANT: Never connect the clamp and ring terminal connectors together
for use in other applications, such as external battery or other power source
charging, or to extend the output cable length, as reverse polarity and/or
overcharge conditions will occur.

•8•
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 BATTERY CLAMP QUICK-CONNECT
1. Connect the end of the charger output cable to the end of the battery
clamp quick-connect.
2. Follow the steps in previous sections to connect the output clamps
to the battery.
3. After a good electrical connection is made to the battery, plug the power
cord into a grounded 120V AC electrical wall outlet.
RING TERMINAL QUICK-CONNECT
The ring connectors permanently attach to the battery, providing easy access
to quickly connect the charger to your battery. This application is appropriate
for motorcycles, lawn tractors, ATVs and snowmobiles.
1. To permanently attach to a battery, loosen and remove each nut from the
bolt at the battery terminal.
2. Connect the red POSITIVE connector ring to the POSITIVE battery terminal.
3. Connect the black NEGATIVE connector ring to the NEGATIVE battery
terminal.
4. Replace and tighten the nuts to secure.
5. Connect the cable to the end of the charger output cord.
Take care to keep the wires and plug away from metal and moving parts.
6. Plug the charger power cord into a grounded 120V AC electrical wall outlet.
12V ACCESSORY PLUG QUICK-CONNECT
Charge or maintain your battery without lifting the hood.
1. Connect the end of the 12V Accessory Plug quick-connect to the charger.
2. Insert the 12V accessory plug into the 12V accessory outlet.
3. Route the power cord from the charger through the vehicle’s open window.
4. Plug the charger power cord into a grounded 120V AC electrical wall outlet.
5. If the vehicle’s ignition key has to be on in order for the accessory outlet
to supply/receive power, turn the key, without starting the engine.
AUTOMATIC CHARGING MODE
When an automatic charge is performed, the charger switches to the maintain
mode automatically after the battery is charged.
BATTERY CONNECTION INDICATOR
If the charger does not detect a properly connected battery, charging will not
start and the digital display will show one of two messages. If the display
shows CONNECT CLAMPS, make sure the charger is connected to the
battery and the connection points are clean and making a good connection.
If the display shows WARNING CLAMPS REVERSED, unplug the charger
from the AC outlet, reverse the connections at the battery, and then plug the
charger back in.
•9•
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 CHARGE COMPLETION AND MAINTAIN MODE
(FLOAT MODE MONITORING)
Charge completion is indicated by the GREEN LED pulsing and the digital
display showing FULLY CHARGED AUTO MAINTAINING. This means that
the charger has stopped charging and has switched to the Maintain Mode of
operation. NOTE: If the charger has to provide its maximum maintain current
for a continuous 12 hour period, it will go into Abort Mode (see Aborted Charge
section). This is usually caused by a drain on the battery, or the battery could be
bad. Make sure there are no loads on the battery. If there are, remove them. If
there are none, have the battery checked or replaced.
MAINTAINING A BATTERY
The 28.71239 maintains both 6 and 12 volt batteries, keeping them at full
charge. It is not recommended for industrial applications.
NOTE: The maintain mode technology allows you to safely charge and
maintain a healthy battery for extended periods of time. However, problems
with the battery, electrical problems in the vehicle, improper connections or
other unanticipated conditions could cause excessive current draws. As such,
occasionally monitoring your battery and the charging process is required.
DESULFATION MODE
If the battery is left discharged for an extended period of time, it could become
sulfated and not accept a normal charge. If the charger detects a sulfated
battery, the charger will switch to a special mode of operation designed for
such batteries. If successful, normal charging will resume after the battery is
desulfated. Desulfation could take up to 8 hours. If desulfation fails, charging
will abort, the GREEN LED will flash, and the display will show CHARGE
ABORTED-BAD BATTERY.
ABORTED CHARGE
If charging cannot be completed normally, charging will abort. When charging
aborts, the charger’s output is shut off, the GREEN LED will flash, and the
display will show CHARGE ABORTED-BAD BATTERY. To reset after an
aborted charge, unplug the charger from the outlet, wait a few moments and
plug it back in.

• 10 •
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 DISPLAY MESSAGES
CONNECT CLAMPS (No LED lit) – Plugged into the AC outlet without the
clamps connected to a battery.
WARNING CLAMPS REVERSED (No LED lit) – Plugged into the AC outlet
and the clamps are connected backwards to a 6V or 12V battery.
ANALYZING BATTERY (Green LED lit) – Plugged into the AC outlet, and
when first connected to a 6V or 12V battery correctly.
CHARGING 12V – XX% (Green LED lit) – Plugged into the AC outlet and
correctly connected to a discharged 12V battery.
CHARGING 6V – XX% (Green LED lit) – Plugged into the AC outlet and
correctly connected to a discharged 6V battery.
FULLY CHARGED AUTO MAINTAINING (Green LED pulsing) –
Plugged into the AC outlet and correctly connected to a fully charged
6V or 12V battery.
CHARGE ABORTED-BAD BATTERY (Green LED flashing) –
Circumstances that could cause an Abort situation during charging:
• The battery is severely sulfated or has a shorted cell and can’t reach
a full charge.
• The battery is too large or there is a bank of batteries and it doesn’t reach full
charge within a set time period.
Circumstances that could cause an Abort situation during maintain:
• The battery is severely sulfated or has a weak cell and will not hold a charge.
• There is a large draw on the battery and the charger has to supply its maximum
maintain current for a 12 hour period to keep the battery at full charge.

MAINTENANCE AND CARE

A minimal amount of care can keep your battery charger working properly for years.
• Clean the clamps each time you are finished charging. Wipe off any battery fluid
that may have come in contact with the clamps, to prevent corrosion.
• Occasionally cleaning the case of the charger with a soft cloth will keep the
finish shiny and help prevent corrosion.
• Coil the input and output cords neatly when storing the charger. This will help
prevent accidental damage to the cords and charger.
• Store the charger unplugged from the AC power outlet in an upright position.
• Store inside, in a cool, dry place. Do not store the clamps clipped together, on or
around metal, or clipped to the cables.

• 11 •
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 TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE REASON/SOLUTION
Battery clamps do The charger is No problem; this is a
not spark when equipped with an normal condition.
touched together. auto-start feature. It
will not supply current
to the battery clamps
until a battery is
properly connected.
The clamps will not
spark if touched
together.
The charger will AC outlet is dead. Check for open fuse
not turn on when or circuit breaker
properly connected. supplying AC outlet.

Poor electrical Check power cord

connection. and extension cord
for loose fitting plug.
I cannot select a 6V The charger is No problem; this is
or 12V setting. equipped with Auto normal.
Voltage Detection,
which automatically
detects the voltage
and charges the
battery.
Green LED is solid The charger needs to The Green LED will
and the display check the condition of be solid when the
shows ANALYZING the battery. charger is checking
BATTERY. the condition of the
battery. This is normal.

• 12 •
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 PROBLEM POSSIBLE CAUSE REASON/SOLUTION
Green LED is flashing The battery is Reset the charger by
and the display sulfated. briefly unplugging it.
shows CHARGE
ABORTED- The battery is too You need a charger
BAD BATTERY. large for the charger. with a higher amp rate.
The display The clamps are Check for poor
shows CONNECT not making a good connection at battery
CLAMPS. connection. and frame.

BEFORE RETURNING FOR REPAIRS

• When a charging problem arises, make certain that the battery is capable of
accepting a normal charge. Double check all connections, the AC outlet for
a full 120 volts, the charger clamps for correct polarity and the quality of the
connections from the cables to the clamps and from the clamps to the battery
system. The clamps must be clean.
• When an UNKNOWN OPERATING PROBLEM arises, please read the
complete manual and call the customer service number for information.
This will usually eliminate the need for return.
If the above solutions do not eliminate the problem,
or for information about troubleshooting
or replacement parts,
call toll-free from anywhere in the U.S.A.
1-800-732-7764
7:00 am to 5:00 pm CT, Monday through Friday

• 13 •
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