11
USING THE BUILT-IN BATTERY TESTER
OVERVIEW
This battery charger has a built-in battery
tester that displays either an accurate
battery voltage or an estimate of the
battery’s relative charge based on the
battery voltage and the Battery Council
International scale.
TESTING SEQUENCE
There are four basic steps required to
use the SC-7500A as a battery tester.
1. Connect the charger battery clamps to
the battery. Be sure to follow all of the
precautions listed under “OPERATING
INSTRUCTIONS”.
2. Connect the charger power cord to a 120V
AC 2-prong wall outlet. Again, be sure to
follow all of the precautions listed under
“OPERATING INSTRUCTIONS”.
3. If necessary, press the BATTERY
TYPE button until the correct type is
indicated.
4. Read the voltage on the digital display
or press the display mode button to set
the tester to BATTERY % and read the
battery percent.
TESTER AND CHARGER
When first turned on, the SC-7500A oper
-
ates only as a tester, not as a charger. To
continue to use it as only a tester, avoid
pressing the CHARGE RATE switch but-
ton. Selecting a charge rate activates the
battery charger and deactivates the tester.
Pressing the CHARGE RATE button when
the 75A Start LED is lit (except during the
180 second cool down) will shut off the
charger and activate the tester.
POWER-UP IDLE TIME LIMIT
If no switch button is pressed within ten
minutes after the battery is first powered
up, the charger will automatically switch
from tester to charger, if a battery is
connected. In that case, the battery will
be set for the 2A charge rate and 12V
REGULAR battery type.
TESTER WITHOUT TIME LIMIT
If either the DISPLAY MODE or BAT-
TERY TYPE button is pressed within
the first ten minutes after the battery is
powered up, the battery will remain a
tester (not a charger) indefinitely, unless
a charge rate is selected.
TESTING AFTER CHARGING
After the battery has been changed from
tester to charger (by selecting a charge
rate), it remains a charger. To change
the battery back to a tester, press the
CHARGE RATE switch until all charge
rate LEDs are off.
TESTER STATUS LEDs
When the SC-7500A is operating as
a battery tester, the status LEDs light
under the following conditions:
• The CHARGED (green) LED will light if
a charged battery is tested.
• The CHARGING (yellow) LED does not
light in the battery test mode.
• The CHECK (red) LED lights unless a
properly connected battery is detected.
• When the tester display mode is set to
VOLTAGE, the CHARGED and CHARG-
ING LEDs won't light.
INITIAL PERCENT CALCULATION
When a battery % is calculated for the
first time after connecting a battery, the
digital display will show three dashes
(“---”) for a period as long as several
seconds while the tester analyzes the
battery.
NOTES FOR TESTING BATTERY %
A recently charged battery could have a
temporarily high voltage due to what is
known as “surface charge”. The voltage
of such a battery will gradually drop during
the period immediately after the charging
system is disengaged. Consequently, the
tester could display inconsistent values
for such a battery. For a more accurate
reading, the surface charge should be
removed by temporarily creating a load on
the battery, such as by turning on lights or
other accessories.
The battery % ranges from 0 to 100.
The battery tester is only designed to test
batteries. Testing a device with a rapidly
changing voltage could yield unexpected
or inaccurate results.
