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Certain parasitic drains will kill the battery overnight. Have you looked into yet? The ac blower motor FSU is the most common cause but telematic unit is the second most.
When the "hedgehog" fails it will prevent sleep. You can confirm sleep when the light on the gear shifter goes out.
–awr–
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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