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Old 01-27-2004, 05:43 PM   #1
DreddRS25
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Join Date: Dec 2003
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Location: San Antonio, Texas
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2001 Impreza RS
BRP

Default Nearly Dead Battery

Quick Q not trying to bump important questions.

If my battery won't turn over my motor after listening to the radio for 15-20mins and needs to be jumped, then does this sound like a nearly dead battery or maybe something else? I had my car off while cleaning my air filter while listening to music.

After I jump the car and let run for few minutes with both cars running, I am able to start up my Subie just fine. However, I have worked on my car twice in the past two weeks. Both times I have had to jump my car to get it started.

What do ya'll think, new battery or get a charger?

One other question. Would a failing battery allow the radio to distort at a lower volume. It seems like I can't turn up my radio too loud without getting distortion. I have a Alpine 9801 + Sony 6.5s XS1621 + stock rear speakers. Sometimes I can crank it up and other times seems like I can barely turn the dial up.
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Old 01-27-2004, 06:00 PM   #2
ATX25RS
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replace the stock battery there is a thread about this over in txic....STOCK SUBARU BATTERIES SUCK ASS!!!
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Old 01-27-2004, 06:17 PM   #3
DreddRS25
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So, would a nearly dead battery cause an increase in radio distortion?
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Old 01-27-2004, 06:43 PM   #4
DrD
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Lead acid batteries don't respond well to deep discharges - every time the battery is driven down to nothing, you significantly reduce it's capacity. (essentially forming a lead sulfate layer which effectively blocks the electrodes) - if the battery has died multiple times, it needs to be replaced.

If the battery is driven down, putting out a lower voltage than the radio wants, then yes, it will cause an increase in distortion.
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Old 01-27-2004, 07:37 PM   #5
DreddRS25
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Yeah I would drain the battery pretty quick without turning on the ignition. So I'll have to get a new battery. Off to Sears. Would get an Optima but here in Texas weather is always mild, so I'll stick to a Sears special.

So, if everytime I drain the battery, then I am essentially shortening its life?








Would an alternator drain the battery and still function without showing symptoms of failure? (Q on the side)
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Old 01-27-2004, 08:29 PM   #6
DrD
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So, if everytime I drain the battery, then I am essentially shortening its life?

Yes.

Would an alternator drain the battery and still function without showing symptoms of failure?

The alternator won't drain your battery, but it could be undercharging it (you need to look at the voltage drop across the battery when the car is running - should be somewhere between 14 and 15V, give or take a little (not sure the spec on the Subie, but that's a pretty typical number))
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Old 01-28-2004, 01:14 AM   #7
kenchan
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dred- give it a good recharge with a battery charger. its possible
that your battery is not charged to the max enough.

as mentioned above, a regular acid battery will prematurely
wear if you drain it with your stereo running. if you want to do
that, you need to get some Optima Yellow tops (deep cycle)
battery. It will still drain, but it will be more constant power
and can be charged over and over many many times without
damaging it.
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