61 00... Battery

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NOTE: Important notes and instructions for handling batteries in the dealership can be found in:

Battery master document.
Disconnecting battery.
BATTERY CHARGE .
Welding work. See 12 00... INSTRUCTIONS FOR WELDING WORK (OVERLOAD PROTECTION OF CONTROL UNITS) .
EXTERNAL JUMP-STARTING AID .

Battery care and maintenance

In low-maintenance batteries, check the electrolyte level at least once a year. If necessary, top up with distilled water up to the top marking.

The increasing number of electronic control units in the vehicle reduces the self-discharging time of the battery (even in standby mode). To maintain the battery service life and to avoid exhaustive discharging, recharge laid-up vehicles every 6 weeks at the latest. The time for self-discharging depends on vehicle type and equipment specification.

Battery test

The battery acid density can be used to measure the state of charge. However this check produces uncertainty caused by a design-related range of variation. The acid density e.g. for a charged battery is 1.28 kg/l (in the variant for hot countries the acid density is 1.23 kg/l).

Another interference factor is the acid layer immediately after filling with distilled water.

Battery wear with partially sulfated and/or heavily contaminated panels will also lead to incorrect acid density test results.