VOLTCRAFT BT-4 Bedienungsanleitung Seite 33

The values in the table are for reference and not binding. In
case of doubt, contact your dealer/manufacturer where you have
bought the car battery.
5. The digital display (2) of the battery tester shows the charging status.
If the charging status is smaller than the battery value (12 V for 12 V
batteries, 6 V for 6 V batteries), the battery must be charged. If charging
does not result in a value higher than the battery value (12 V / 6 V),
the battery is defective. If there is no value shown in the digital display
(empty display), check for proper contact of the terminal clamps and for
correct polarity (+/-). If all is correct as intended, but the digital display
does not show anything, the battery is defective.
6. Press the LOAD button (5) to start the battery load test. A beep sounds
and the test starts. The test will take approx. 10 seconds. After that, a
beep sounds indicating the completion of the test. After completion of
the battery load test, the LED display (1) will show GOOD, WEAK, or
BAD according to the battery status. See the table "Battery load test
analysis" below. The LED display remains until you press any of the
buttons on the battery tester or disconnect one of the terminal clamps
from the battery.
7. If the test results in a battery charge of less than 12 V (for 12 V
batteries) or less than 6 V (for 6 V batteries), the digital display will
show "- L -". The battery must be charged in such a case. See bulletin 5
(e.g. battery defective, bad contact at the terminal clamps), if charging
does not result in a satisfactory value. If the test results in a battery
charge of more than 18.5 V (for 12 V batteries) or more than 9 V (for 6
V batteries), the digital display will show "- OL -". This indicates that the
battery is overcharged and that the load test cannot be performed.
8. Remove the terminal clamps after testing. First disconnect the negative
clamp and then disconnect the positive clamp.
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