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OVERVIEW
This battery charger has a built-in battery
tester that displays either an accurate
battery voItage or an estimate of the
battery's relative charge based on the
battery voItage and the Battery Council
International scale.
TESTING SEQUENCE
There are four basic steps required to
use the 71227 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 wail outlet. Again,
be sure to follow all of the precautions
listed under "OPERATING INSTRUC-
TIONS".
3. If necessary, press the BATTERY
TYPE button until the correct type is
indicated.
4. Read the voltage on the digital disptay
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 71227 oper-
ates only as a tester, not as a chargen 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 125A Sta4 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 15
minutes after the charger is first powered
up, the charger will automatically switch
from tester to charger, if a battery is
connected. In that case, the charger 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 charger is
11
powered up, the charger will remain a
tester (not a charger) indefinitely, unless
a charge rate is selected.
TESTING AFTER CHARGING
After the charger has been changed from
tester to charger (by selecting a charge
rate), it remains a charger. To change
the charger back to a tester, press the
CHARGE RATE switch until atl CHARGE
RATE LEDs are OFR
TESTER STATUS LEDs
When the 71227 is operating as a bat-
tery tester, the status LEDs tight under
the following conditions:
• The CHARGED (green) LED wilI tight if
a charged battery is tested.
• The CHARGING (yellow) LED does net
Iight 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 caIcuIated 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 anaIyzes the
battery.
NOTES FOR TESTING BATTERY %
A recently charged battery could have a
temporarily high voItage due to what is
known as "surface charge". The volt-
age 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 temporar-
ily 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.