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					Originally Posted by  986 Boxster
					 
				 
				If you don`t lock a car now a days, the car wont go into sleep mode. You should lock it and activate the alarm whenever you don`t plan on driving it for a few hours. Car electronics will still think that you are driving it and wont shut off completely (going to sleep), therefore draining your battery slowly. 
			
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Yeah, I suppose that could be true, though like piper, I hardly ever lock mine.  And my battery is about 6.5 years old and still crankin' great.
Of course, the fact that I use one of these at least part of the time probably helps