Operating Instructions - Schumacher Electric SC-7500Al SC-8020A Owner's Manual

DIGITAL DISPLAY
The Digital Display gives a digital indication
of battery %, voltage or alternator %,
depending on the Display Mode chosen.
DISPLAY MODE BUTTON
Use this button to set the function of the
digital display to one of the following:
• Battery % – The digital display shows
an estimated charge percentage of
the battery connected to the charger's
battery clamps.
• Voltage – The digital display shows the
voltage at the charger battery clamps, in
DC volts.
• Alternator % – The digital display shows
an estimated output percentage of the
vehicle's charging system connected to
the charger battery clamps, compared to
a properly functioning system.
BATTERY TYPE BUTTON
Use this button to select the type of battery.
• STANDARD – 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.
Regular batteries should not be used for
deep-cycle applications.
• AGM – The Absorbed Glass Mat
construction allows the electrolyte to be
suspended in close proximity with the

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.
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.
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
• GEL CELL – The electrolyte in a GEL cell
has a silica additive that causes it to set
up or stiffen. The recharge voltages on
this type of cell are lower than those for
other styles of lead-acid battery. This is
probably the most sensitive cell, in terms of
adverse reactions to overvoltage charging.
Gel batteries are best used in VERY
DEEP cycle application and may last a bit
longer in hot weather applications. If the
wrong battery charger is used on a gel cell
battery, poor performance and premature
failure will result.
CHARGE RATE SELECTOR/
BATTERY SIZE BUTTON
Use this button to select the charge rate
or engine start setting.
• Small Battery – For small batteries,
such as those commonly used in garden
tractors, snowmobiles and motorcycles.
Also used to maintain fully-charged large
batteries.
• Large Battery – For charging medium to
large capacity batteries. Not intended for
industrial applications.
• Engine Start – Provides additional
amps for cranking an engine with a
weak or run-down battery. Always use in
combination with a battery.
8. Select the battery type and charge 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 charge 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.
• 6 •