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Old 02-20-2012, 03:36 PM
 
Location: Planet Eaarth
8,954 posts, read 20,598,488 times
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Quote:
Originally Posted by LongtimeBravesFan View Post
does it drain the car's battery if you leave the cell phone charger plugged in and the car off, even if the phone is not being charged?
The simple answer is........no your charger alone can't drain your battery.

Why?

In order for the charger to draw power there must be a compete circuit made. That can only happen when the phone is plugged in and charging. The phone charging circuits will cut off when the phone is full stopping the draw of electricity.

The bare cord plugged in is just that.......a bare inactive cord doing nothing.
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Old 02-20-2012, 03:42 PM
 
105,674 posts, read 107,645,851 times
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many vehicles today offer phone charger power ports that stay live all the time. my jeep and bmw feature that.

the real issue is many of these cars have internal housekeeping that goes on after you turn off the car.

the circuits usually go to sleep within 15 minutes or so.

if the charger pulls to much current the other circuits in the car may not power down and go to sleep. some chargers even have their own current draw when not charging a phone . my camera chargers are like that,they are always warm even when not charging.



heres a service bulletin i found on line pertaining to bmw's.
----------------------------------------------------------------------------------------------------------------------
SI B 61 12 05
General Electrical Systems November 2005
Technical Service

This Service Information bulletin supersedes S.M. B61 203 05 dated April 1, 2005.

SUBJECT
Dead Battery Caused By MPM


MODEL
E60/E61 (5 Series), E63/E64 (6 Series) produced up to September 2005


CAUSE
An accessory plugged into the cigar lighter / power supply causes a back-feed of voltage into the vehicle electrical system when the ignition is switched off. This causes the MPM (Micro Power Module) to stay awake, and the vehicle battery to discharge.

Energy diagnosis identifies the MPM as the "sleep mode preventer".

Last edited by mathjak107; 02-20-2012 at 03:54 PM..
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