Schumacher SC1591 Owner's Manual page 6

8. When charging is complete, or if you want to stop charging, press the START/STOP button, press the
POWER ON/OFF button, disconnect the charger from the AC power, disconnect the clamp attached
to vehicle's chassis, and finally remove the clamp from battery terminal.
9. A marine (boat) battery must be removed and charged on shore.
CHARGE RATE
The charger will automatically adjust the charging current, based on battery size, in order to charge the
battery completely, efficiently and safely.
BATTERY CHARGING TIMES
BATTERY
APPLICATION SIZE
POWERSPORTS 6Ah
32Ah
AUTOMOTIVE 300 CCA
1000 CCA
MARINE 50Ah
105Ah
Times are based on a 50 percent discharged battery and may change, depending on age and condition of battery.
AUTOMATIC CHARGING MODE
When an Automatic Charge is performed, the charger switches to the maintain mode automatically after the
battery is charged.
ABORTED CHARGE
If charging cannot be completed normally, charging will abort. When charging aborts, the charger's output
is shut off and the BAD BATTERY (red) LED will light. The digital display will show an error code (see
Troubleshooting for a description of the error codes). Do not continue attempting to charge this battery.
Have it checked or replaced.
DESULFATION MODE
Desulfation could take 8 to 10 hours. If desulfation fails, charging will abort and the BAD BATTERY (red)
LED will light.
COMPLETION OF CHARGE
Charge completion is indicated by the 12V CHARGING (green) LED. When lit, the charger has switched
to the maintain mode of operation.
MAINTAIN MODE (FLOAT MODE MONITORING)
When the 12V CHARGING (green) LED is lit, the charger has started maintain mode. In this mode, the
charger keeps the battery fully charged by delivering a small current when necessary. 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.
MAINTAINING A BATTERY
The unit charges and maintains 12V batteries.
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.
USING THE ENGINE START FEATURE
Your battery charger can be used to jump start your car if the battery is low. Follow all safety instructions
and precautions for charging your battery. Wear complete eye protection and protective clothing. The
engine start feature can be used with the charger connected to an AC outlet or disconnected from the outlet
and used as a portable unit. Follow the appropriate instructions for each below.
WARNING: Using the Engine Start feature WITHOUT a battery installed in the vehicle could cause
damage to the vehicle's electrical system.
CHARGING TIME (Hours)
2A 6A 8A 10A
6 2 1.75 1.5
15 5 4.5 4
12 4 3.5 3
30 10 8.5 7
15 5 4.25 3.5
33 11 9.5 8
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