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      08-27-2010, 02:07 PM   #14
Technic
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Drives: 2015 320i
Join Date: Apr 2005
Location: Ft Lauderdale, Florida

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That's the point... the 20 minutes shut down rule is for not to discharge the battery below the cranking voltage. The OP wants to keep the radio playing longer than 3 minutes without using the key/ACC.