I have a 2008 Buick Enclave and a passenger last night ran the audio
CD for at least an hour with the car either in accessory or in the run
position, engine not running. This ran the battery down and needed a
jump to get the car started. My questions are:
1. Would running the audio system for an hour cause the battery to
run down with in the key in the accessory position (with an in-dash
2. Possibly, the passenger could have put the ignition in the run
position (engine not running). Would one hour in the run position and
audio system on cause the battery to run down? I think it would.
3. More inportantly, how long would it take for car charging system to
fully charge the battery? It seemed that it was fully charged today
after running for a couple of hours.
Thanks for your nice replies. I do not think the key was in the run
position, but I thought I'd ask the question anyway. As I mentioned,
all is well now. And I like the 30/30 rule. Something to keep in
Let me tell you from personal experience, one as recently as two weeks ago,
that leaving the ignition switch in "on" position WILL drain the battery
pretty quickly. My wife has twice went to the garage, got in her Equinox
and needed to turn on the switch to remove CD's from the player... then
leaving the switch on overnight, and it's COMPLETELY dead the next morning.
It is also noteworthy that, at least on our Chevy, the key will NOT come out
of the ignition, the car will NOT shift into neutral (which makes it very
difficult to push out of the garage if that were necessary)... This car
locks itself down completely.
however like you, I found that running it for an hour brings it back up to a
reasonable charge and presumably it finishes charging in the subsequent
I also tried one of those emergency battery packs (Black & Decker) and it
just didn't have enough power. but it did have enough power to allow me to
shift the car into neutral so I could push it out of the garage and jump
start it with my Jetta.
I've heard that as well, but having done it twice, the car starts with the
usual power. Plus it's generally garage kept, so not too worried about cold
weather, but perhaps this fall I'll purchase a new one just for security
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