BMW E90 battery drains overnight
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What is the normal quiescent current and charging voltage of an E90?
The quiescent current should be about 22 mA, and a quiescent current over 80 mA gives a fault message. While driving, the charging voltage should be about 13.8-14.6 V.
Can aftermarket LEDs drain the battery?
Yes. Cheap LEDs in the interior lights can cause several fault codes, a drained battery and the clock resetting. Restoring the original bulbs removed the fault.
The battery drains and the clock resets even though the battery is new. What should be checked?
Measure the charging voltage: 15.5 V is too high, the reference value is about 15 V or below. Undervoltage can cause some of the fault codes. Replacing the battery alone does not necessarily fix the clock resetting.
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