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Item 62553
Page 6
The Tool Experts
05 2022-1
Assessment of the state of charge via the battery acid density
If the acid density at 27
℃
is 1.24
㎏
⁄
dm³
or less, please first charge the battery before carrying out further
tests and check the acid density again after one hour of standing time.
Acid density at 27
℃
(
㎏
⁄
dm³
)
State of charge
Actions
1,25–1,28
Charged
Test possible
1,20–1,24
Half charged
Charging recommended
Lower as 1,20
Poorly charged
Load immediately
The acid density should be the same in all cells of a good battery. Maximum permissible tolerance
between highest and lowest measured value of the 6
cells: 0.03
㎏
⁄
dm³
. If the acid density is the same in
all cells but less than 1.25
㎏
⁄
dm³
, please charge the battery.
Temperature compensation
•
Due to the chemical reactions that take place in a lead-acid battery, the test results depend on
the battery temperature. To obtain the most accurate test results possible, compensation must
be carried out from approx. –8
℃
.
•
This is achieved by subtracting 50 amperes of cold test current from the printed value of the
battery’s cold test current for each –10
℃
cold. This means that at –20
℃
100
A and at –30
℃
150
A cold test current are subtracted.
•
Example: If the printed battery cold test current is 500
A and the test is carried out at –18
℃
,
use the 400 CCA scale.
Testing the charging system
With the help of the battery tester, many small general faults in the charging circuit can be quickly and
easily detected. The motor should be at normal operating temperature for testing.
a)
Connect the battery tester to the vehicle battery with the correct polarity.
b)
Start the engine and run it at a speed of at least 1500
r
⁄
min
.
c)
Do
not
operate the test switch on the unit!
d)
Read the display when the electrical consumers (light, fan, etc.) are switched off. The needle
should be in the green area (“Ok”) at approx. 14
V.
e)
When the electrical consumers are switched on, the needle should remain in the green area.
f)
If the needle is in the red area above or below the green area, this indicates a fault in the
charging circuit (e.g., defective charge controller).
Testing the starter motor
This test detects excessive current consumption of the starter motor. Excessive current consumption of
the starter motor leads to an overload of the battery and thus shortens its life. This test should only be
carried out if the battery load test was previously completed with “OK.”
For testing the motor should have normal operating temperature.
a)
Connect the test device to the vehicle battery with the correct polarity.
b)
Press the test button for max. 10
s and note down the voltage value while keeping the test button
pressed.
c)
Disconnect the engine ignition cable from the spark plug so that the engine does not start when
starting.
d)
Now try to start the engine. Make a note of the voltage during the starting procedure.
