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Old 09-24-2011, 01:04 PM   #1
droveavolvoonce
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Default Dead battery after short period with engine off - what's going on?

After work yesterday, I decided to sit in the driveway listening to the radio. My headlights were on(yeah I should have turned them off), and the car was not running. When I went to exit the car no more than 30 minutes later, I noticed my radio headunit wasn't displaying the time - and that usually means bad things. I tried to start the car, and failed to get more than the usual 'click click' I associate with a dead battery.

Fortunately, I was at home so I bagged up the trickle charger to keep it out of the rain and connected the car for a couple of hours - after which it started up fine.

I've had this sort of thing happen several times before - generally I'll be working on the car or something with the radio on and the engine off. It seems to take a very short period of time for the battery to drain to the point where the car won't start.

Is something strange going on here? I last had the car in with my mechanic a couple of weeks ago, and he said both the alternator and battery look fine!

What's up with this?

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daVo

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Old 09-24-2011, 02:46 PM   #2
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Default Re: Dead battery after short period with engine off - what's going on?

1-Leaving the ignition ON will drain the battery quicker as the entire EFI system is running. Leaving the ignition switch in the ACC(essory) position shouldn't since this supplies power to the HVAC blower, power windows, radio and defrost grid (if one exists). Presuming everything is off but the radio shouldn't drain the battery unless power is being drained from one of the sources listed.

2-How old is the battery? Older than 4yrs makes this a sketchy battery when using the radio for several hours.

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Old 09-24-2011, 05:08 PM   #3
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Default Re: Dead battery after short period with engine off - what's going on?

Probably a dying battery. Garage should have a machine to measure capacity.

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Old 09-24-2011, 10:01 PM   #4
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Default Re: Dead battery after short period with engine off - what's going on?

From here I can see that the battery looks fine as well. If I were to test it i suspect that it would fail.

Di your mechanic actually load test the battery. If they did and it passed then the headlamps on for 1/2 an hour or so plus radio etc is what did you in.

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Old 09-25-2011, 06:47 AM   #5
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Default Re: Dead battery after short period with engine off - what's going on?

Takes ~2hrs for my stereo & 5ch amp at moderate levels to drain the battery. Takes ~30min for the lights to do the same.

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Old 09-25-2011, 08:53 AM   #6
spud42
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Default Re: Dead battery after short period with engine off - what's going on?

its very limited in how many Excessive deep discharges it can handle
any 12-volt lead-acid battery discharged below 10.5 volts can damage the battery
trickle charge more then a couple hours more like 1/2 a day or so
I wouldn't bag it put it under the hood and close it
or rest the hood on something so its almost closed

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