https://www.XPOtool.com Item 62553 Page 4
The Tool Experts
05 2022-1
With this device, the performance of a 6 V or 12 V battery or accumulator can be measured. The device
measures the battery voltage at a current flow of approx. 100 A.
The voltage of a “good” and fully charged battery remains relatively constant under load. On the other
hand, with a “bad” battery, the voltage collapses quickly. The measurement results are displayed by a
precise analogue measuring unit, whose scale is designed for different battery sizes and types.
Operating the tester
Warning! When handling lead-acid batteries, highly explosive detonating gas may be produced.
This oxyhydrogen gas can be ignited by a spark, cigarette, or open flame, causing the battery or accu-
mulator to burst. This causes the sulphuric acid inside to be sprayed and can lead to severe burns.
Therefore, always wear protective goggles when handling lead-acid batteries. Avoid contact of the bat-
tery with skin and clothing and wear rubber gloves. Do not smoke near the battery and avoid naked
flames. Ensure adequate ventilation.
Discharged lead-acid batteries freeze at extremely low temperatures. Never check a frozen lead-acid
battery! Never place the tester or tools on the battery! Never test a lead-acid battery for longer than
10 min!
In the event of eye contact with acid, immediately rinse the eye with clear water for at least 5 min and
seek medical attention immediately! Under no circumstances use medication or eye drops without doc-
tor’s instructions.
Things to know about (rechargeable) lead-acid batteries
•The efficiency of a lead-acid battery decreases as temperatures fall. A fully charged battery
has only 40 % of the starting power at –18 ℃ that it normally has at 25 ℃.
•Most batteries break down due to overcharging.
•Heavy discharging does not damage the cells of a battery, but overcharging does.
•A warm battery charges faster than a cold one.
•All batteries are subject to normal self-discharge, which increases with increasing tempera-
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. Atten-
tion! The battery must not be frozen!
•A fully charged battery freezes at approx. –65 ℃, a 50 % charged battery at –26 ℃ and a
25 % charged battery already from –15 ℃.
•A battery stored in a discharged state “sulphates” and loses its capacity.
Battery load test
1. Connect the battery tester to the battery.
a) 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.
Note: 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 ex., 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 deactivate the alarm.
b) Connect the black terminal of the test device directly to the negative battery pole (NEG, N, –),
the red one directly to the positive battery terminal (POS, P, +).
