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Re: Battery drain after 1 hour cellphone charge? (archive)

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Posted by Bob on January 29, 2000 at 08:26:20:

In Reply to: Battery drain after 1 hour cellphone charge? posted by RP on January 29, 2000 at 02:35:00:

: Last night, I left my Startac cell phone charging in my 2000 540 for 1 hour with enigne off. I did not realize that the cigarette lighter port stays on even with engine off.

: Anyways, when I got back to the car after dinner, the would not start on it's first try. Since it has the autoignition, no sound whatsoever during the start. I removed the cell phone charger from the cigarette port. Waited a few seconds and then try again. It started as normal.

: Perhaps the cell phone took enough charge from the battery to a level where the autoignition could not start the car?? Is this possible with a 1 hour charge with engine off?

: RP

Yes it is. The stock BMW should not draw more than .05 amps when engine is off. Try this. Hook up the phone the way you did. Disconnect the battery negative cable. With a digital voltmeter set at amps touch the negative cable with the negative probe on the meter and the battery post with the positive probe from the meter and see what the drain is. If it is more than .1 amp you have too much of a drain.

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