Schumacher Electric SE-40MAP Owner's Manual page 14

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The more a battery is discharged, the faster it absorbs charge
from a charger. That means that the charge % increases faster
at the beginning of the charging process than at the end. In other
words, it takes longer for the battery to absorb the last few per-
cents of charge than the first several percents.
Automatic Charging
If the charger has an Automatic Charge Mode, it can perform an automatic
charge. When an Automatic Charge is performed, the charger switches to
the Maintain Mode (see below) automatically after the battery is charged.
For a battery with a starting voltage under 1 volt, use the Manual Mode
first to pre-charge the battery for five minutes, to get additional voltage into
the battery for the charger to analyze.
Manual Charging
If the charger does not have an Automatic Charge Mode, you will be
charging in Manual Mode. A manual charger will continue to charge
and will not shut off. You must keep a visual check on the ammeter to
determine when the battery is charged. Be sure to monitor the charging
process and stop it when the battery is charged. Not doing so may cause
damage to your battery or result in other property damage or personal
injury.
Completion of Charge (Automatic Chargers Only)
When the FULL CHARGE (green) LED is lit, the charger has stopped
charging and switched to the Maintain Mode of operation. If the 12V DEEP
CYCLE battery type was selected, the CHARGED (green) LED comes on
when the battery is charged enough for normal use.
Maintain Mode
When the FULL CHARGE (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 battery voltage drops
below a preset level the charger will go back into charge mode until the
battery voltage returns to the full charge level, at which point the charger
will return to maintain mode. The voltage is maintained at a level deter-
mined by the BATTERY TYPE selected.
NOTE: The charger automatically switches between Charge Mode and
Maintain Mode as necessary. The FULL CHARGE (green) LED will cycle
on when the battery is at full charge and off when the voltage drops below
a preset level and the charger goes into Charge Mode. This cycle will con-
tinue, and the FULL CHARGE (green) LED will stay on for longer periods
of time as the battery becomes more fully charged.
Using the Engine Start feature (If equipped)
Your battery charger can be used to jump start your car if the battery is
low. Follow these instructions on how to use the ENGINE START feature.
IMPORTANT: Follow all safety instructions and precautions for charg-
ing your battery. Wear complete eye protection and clothing protection.
Charge your battery in a well-ventilated area.
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