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Hello everyone! I've got a question about my new 2003 330i. If I'm sitting in the car waiting for my kid or something, I often like to play the radio or a CD. I've had problems with previous cars (non-BMWs) where the battery died if I used the radio without the engine running (and alternator charging the battery). So I'm wondering if it's safe to run the 330's radio without the engine running, and, if so, how long I can do it without starting to drain the battery too much. Also, if I should run the engine while sitting there waiting (so the alternator keeps the battery charged), is that doing any damage to the engine, since the car isn't moving? How long can the engine idle without the car moving before it starts being a problem?

I guess I'm asking, "Which is worse for the car: running the radio off the battery while the engine's off -or- letting the engine idle for (10, 30, 60, etc.) minutes?

Thanks in advance!
 

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I let my radar detector run all nite without disconnecting it. Also, I have run radio while I'm cleaning car without running out of battery juice. Play the radio and fuhgetabooutit.
 

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When I clean out my car or just sit in it I leave the radio on ...I've left it on without the car running for 2 hrs..nothing has ever gone wrong for me :D ..........yet :unsure:
 
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