Acid Level Check
The liquid level should be 5 mm above the plates. If there is a label for the acid level, then you need to focus on it. Use only distilled water for topping up.
Batteries with too high an acid level may (long day trips) overheat. Too low a level will shorten battery life.
(27-528) since August 1981, battery plugs can only be removed with a screwdriver. To do this, pierce the synthetic film with a screwdriver in the notch intended for this.
Insert a screwdriver into the notch. Turn the plug to the left of the stop.
Unscrew the plug by hand.
The plug can be screwed back in by hand.
Batteries since August 1981 are almost maintenance-free. During normal operation, it is only necessary to check the fluid level every 2 years and, if necessary, add it.
Acid Density Check
The density of the acid, together with the measurement of the voltage, makes it possible to accurately judge the battery's charge level. An acid meter is used to test. The greater the specific gravity of the acid sucked out of the battery, the higher the float floats. On a scale, the acid concentration can be read in g / ml or in Baumé degrees. The following values must be reached:
Attention! An unused battery will self-discharge. If the battery is not checked and charged in a timely manner, this can lead to irreversible destruction of the plates. Therefore, if the car is not used for a long time, it is necessary to discharge and recharge the batteries every four weeks.
Voltage test
Voltage can be measured with a battery tester (see fig. 27-030).
With a load current of about 110 A, the voltage should not be less than 9.6 V. If during the measurement (5 to 10 sec.) its voltage falls below the specified level, the battery is discharged or defective.
Cleaning the battery poles
When regularly inspecting the car, the battery poles and connecting terminals should also be cleaned and lubricated with anti-acid grease.
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