Therefore, the car battery tester does not require any supply voltage from another battery or from the mains voltage. The car battery tester is thus supplied with voltage via the battery to be tested. In order for the car battery tester to switch on automatically, the battery to be tested must have a residual voltage of 9 V and not more than 35 V. As soon as the car battery tester is connected, it switches on by itself. To carry out the measurement, the car battery tester must first be connected to the battery. When testing the battery with the car battery tester when the car is started, the voltage drop of the battery is measured by the test device. The voltage difference provides information about the condition of the 12V or 24 V battery. In addition to checking the battery, the car battery tester can also test the alternator from the car. All measured values and test results are displayed on the LCD. The battery tester uses Kelvin clamps on 70 cm long measuring leads to measure the battery voltage. The Automotive Tester tests 12 V and 24 V starter batteries. The vehicle battery tester checks the condition of the car battery via the battery voltage in the charging cycle, when starting or when idling. The battery tester uses the battery voltage to determine whether the starter battery is still functional. The battery tester also shows the status of the battery in% on the LC display and makes a recommendation as to whether the starter battery should be replaced if necessary.
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