Schumacher SC1308 User Manual Download Page 5

 RATE SELECTION BUTTON

Use this button to select one of the following:

 

6<>2A CHARGE/MAINTAIN – 

For 

charging small and large batteries. Not 

recommended for industrial applications.

 30A BOOST –

 For quickly adding 

energy to a severely discharged or large 

capacity battery prior to Engine Start. 

 100A ENGINE START –

 Provides 

additional amps for cranking an engine 

with a weak or run-down battery. Always 

use in combination with a battery.

NOTE:

 Once the charger has started 

charging the battery; if you press the Rate 

Selection 

 

button once, the output 

current is shut off and the display will show 

OFF

 and then the battery voltage. If you 

press the Rate Selection button again, the 

current will go back on at the same setting 

it was when it was turned off. 

LED INDICATORS

 

CLAMPS REVERSED (red) LED 

flashing: 

The connections are reversed.

 (yellow/orange) LED lit:

  

The charger is charging/boosting 

the battery.

 CHARGED/MAINTAINING (green) 

LED lit:

 The battery is fully charged and 

the charger is in maintain mode.

NOTE:

 See

 Operating Instructions 

for a 

complete description of the charger modes.

 BATTERY TYPE BUTTON 

Use this button to select the type of battery.

– Used in cars, trucks and

motorcycles, these batteries have 

vent caps and are often marked “low 

maintenance” or “maintenance-free”. 

This type of battery is designed to 

deliver quick bursts of energy (such as 

starting engines) and has a greater plate 

count. The plates are thinner and have 

somewhat different material composition. 

Standard batteries should not be used for 

deep-cycle applications.

– The Absorbed Glass Mat

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. The AGM batteries 

are a variant of Sealed VRLA (valve 

regulated lead-acid) batteries. Popular 

uses include high-performance engine 

starting, power sports, deep-cycle, solar 

and storage batteries.

11. OPERATING INSTRUCTIONS

WARNING:

 A spark near the battery may

cause an explosion.

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 (except

in Engine Start mode).

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.

5.

Lay the AC/DC cables away from any

fan blades, belts, pulleys and other

moving parts.

6.

Connect the battery, following the

precautions listed in sections 6 and 7.

7.

Connect the charger to an electrical

outlet.

8.

Select the battery type and desired rate.

9.

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 the battery, following the

precautions listed in sections 6 and 7.

4.

Connect the charger to the electrical

outlet.

5.

Select the battery type and desired rate.

6.

When charging is complete,

disconnect the charger from the AC

power, disconnect the negative clamp,

and finally the positive clamp.

7.

A marine (boat) battery must be

removed and charged on shore.

BOOST MODE

To select the Boost mode, press the 

Rate Selection button until the yellow/

orange 

 

30A Boost LED lights solid. 

The 

 

LED will light solid if battery is 

properly connected and the boosting 

process will start. While in Boost mode, 

the display will show the voltage. If a bad 

battery is detected, the display will show 

bad

 / 

bat

” and an error code. 

NOTE

: Boost mode will remain energized 

until the Rate Selection button is pressed.

Summary of Contents for SC1308

Page 1: ...AL AND READ BEFORE EACH USE This manual will explain how to use the battery charger safely and effectively Please read and follow these instructions and precautions carefully MODEL SC1308 Automatic Ba...

Page 2: ...THE INSTRUCTIONS EACH TIME YOU USE THE CHARGER b To reduce risk of battery explosion follow these instructions and those published by battery manufacturer and manufacturer of any equipment you intend...

Page 3: ...sition and removing AC cord from electric outlet Never allow clips to touch each other 5 2 Attach clips to battery and chassis as indicated in sections 6 and 7 6 FOLLOW THESE STEPS WHEN BATTERY IS INS...

Page 4: ...tates is not recommended and should not be used 8 3 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 ex...

Page 5: ...ed VRLA valve regulated lead acid batteries Popular uses include high performance engine starting power sports deep cycle solar and storage batteries 11 OPERATING INSTRUCTIONS WARNING A spark near the...

Page 6: ...uous 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 MAINTAINING A BATTERY The SC1308 charges and main...

Page 7: ...ery Voltage Reading 12V Battery Voltage Reading Battery Condition 6 4 or more 12 8 or more Charged 6 1 to 6 3 12 2 to 12 7 Needs charging Less than 6 1 Less than 12 2 Discharged TESTER AND CHARGER Whe...

Page 8: ...arge voltage May be caused by trying to charge a large battery or bank of batteries on too low of a current setting Try again with a higher current setting or have the battery checked or replaced F04...

Page 9: ...and charges the battery No problem this is normal I press the display button but do not see the percentage of charge When first connected to a battery the display shows voltage only This is normal Th...

Page 10: ...0 sec max on 120 sec min off 100A int 5 sec max on 180 sec min off cUL Input 120V AC 60Hz 4A continuous 19A intermittent Output 6V 12V DC 2 6A int 25A int 60 sec max on 120 sec min off 90A int 5 sec m...

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