Battery Load Test - WilTec 62553 Operation Manual

Things to know about lead-acid batteries (rechargeable batteries)
The efficiency of a lead-acid battery decreases as temperatures fall. A fully charged battery
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has only 40% of the starting power at -18°C that it normally has at 25°C.
Most batteries break down due to overcharging.
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Heavy discharging does not damage the cells of a battery, but overcharging does.
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A warm battery charges faster than a cold one.
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All batteries are subject to normal self-discharge, which increases with increasing tempera-
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ture. The self-discharge of maintenance-free batteries is less than that of normal lead-acid
batteries.
Batteries should be stored in as cool a place as possible to keep self-discharge low.
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Attention! The battery must not be frozen!
A fully charged battery freezes at approx. -65°C, a 50% charged battery at -26°C and a
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25% charged battery already from -15°C.
A battery stored in a discharged state "sulphates" and loses its capacity.
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Battery load test

1. Connect the battery tester to the battery
If the battery is still installed in a vehicle, switch off the engine of the vehicle and switch off all other
consumers in the vehicle. Please note that the on-board voltage can drop very sharply during the test
(especially if the batteries are severely discharged or defective), which can trigger an alarm system,
for example, or trigger a car radio with anti-theft protection (coding). In any case, make sure that the
coding of the radio is deactivated before the load test, or have the code ready to be deactivated.
Connect the black terminal of the test device directly to the negative battery pole (NEG, N, -). Connect
the red terminal of the tester directly to the positive battery terminal (POS, P, +).
A battery voltage dependent on the battery's state of charge is now shown on the display instrument of
the device. If the displayed voltage is less than 12.4 volts (6.2 volts), the battery should be charged by
a load test. If the voltage is still below 12.4 volts (6.2 volts) after charging, it can be assumed that the
battery is defective.
If the needle of the display is at the extreme left end of the display, the battery tester is connected with
the wrong polarity.
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Artikel 62553 Seite 5
11 2020-1