1 Series E81 130i (N52K) 3-door
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Important notes and instructions for handling batteries in the dealership can be found in:
Battery master document
External jump-starting aid
Battery care and maintenance
In low-maintenance batteries, check the acid 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 car 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 (refer to battery recharging schedule here, SI 6 10 398 387
). The time for self-
discharging depends on vehicle type and equipment specification.
The battery acid density can be used to measure the charge state. However this test 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 tropical version the
acid density is 1.23 kg/l).
Another interference factor is the acid lamination immediately after filling with distilled water.
Battery wear with partially sulphated and/or heavily contaminated plates will also lead to incorrect acid density test
BMW AG - TIS
Issue status (12/2007) Valid only until next DVD is issued
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