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Old 12-21-2004, 03:12 AM   #1
949
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Question stock battery

will the stock battery recover from a complete power drain?
if yes how long before it fully recovers , basically how many hours of driving does it need?

if not, how long do i have before i need to buy a new batt?
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Old 12-21-2004, 07:11 AM   #2
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Possibly but more likely not. Standard lead-acid batteries are not intended to sustain a full discharge and may be damaged. It may come back with reduced capacity, or not at all. Or you could get lucky and have it be ok.
Driving around will not be sufficient to fully recharge a battery that has been completely discharged. It has to be removed from the car and charged on a proper battery charger. Once fully charged it should be load-tested to check its capacity and whether it can properly hold a charge. If it tests as weak it should be replaced.
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Old 12-21-2004, 08:13 AM   #3
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....the stock battery is NFG....the sooner you replace it the sooner you won't have to worry about it not starting the car one am.
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Old 12-21-2004, 12:51 PM   #4
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ty.
what is NFG?
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Old 12-21-2004, 01:13 PM   #5
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my stock batterie took a dump on me after 24k in miles. It drained somehow and upon charging it, it wouldn only hold enough juice for one turn over. after that it wouldnt hold anything more. It usually took my wrx a good 30 minute drive for it to recharge enough for one turn over.

Then I got a new batter under warranty and havent had that issue since. They stock batterie they come with SUCKS! ITs SO oldschool! The one they replaced it with was better, but still not maintence free.
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Old 12-21-2004, 01:25 PM   #6
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He meant No ******* Good in his opinion. My stock OBS battery lived 5 full years and just died on me today so I think the OE Panasonics aren't that bad.

A fully discharged battery can usually be charged back to full capacity it had before the discharge provided it hasn't sat discharged too long (as in weeks or months) The caveat is that sometimes it takes a special charger that can adjust to higher than normal voltage with a low amp flow to keep from cooking the battery plates. If you have a standard charger that maybe has a dual amp setting try charging for an hour or two at the higher setting then continue a full day at the lowest amperage. When your terminal voltage stabilizes at 12.64 V or better it's fully charged. To get a good voltage reading just open a door for a couple of minutes to take the excess surface charge off then take the reading. You can just boost it off and drive around a bunch to charge it but it may not ever reach full capicty that way and it will put a big load on your alternator which is way more expensive than a new battery.
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Old 12-21-2004, 01:29 PM   #7
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Quote:
Originally Posted by GuyLR
The caveat is that sometimes it takes a special charger that can adjust to higher than normal voltage with a low amp flow to keep from cooking the battery plates. If you have a standard charger that maybe has a dual amp setting try charging for an hour or two at the higher setting then continue a full day at the lowest amperage. When your terminal voltage stabilizes at 12.64 V or better it's fully charged.

I disagree with that statement. The OE panasonic batterie is from 1970 pratically. Look at it, its SO old school.

If you read your manual, it clearly says NOT to charge your OE Panasonic batterie higher than 10 volts!!!! So putting a "special" charger at a higher setting goes against what your manual says to do, if you run into a dead batterie.

I read my manual.
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Old 12-21-2004, 02:41 PM   #8
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just duct tape 30 9v batteries together you'll be fine
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Old 12-21-2004, 04:05 PM   #9
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optima red top.

<--needs a new battery.
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Old 12-21-2004, 04:43 PM   #10
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Quote:
Originally Posted by djennison
If you read your manual, it clearly says NOT to charge your OE Panasonic batterie higher than 10 volts!!!!
I'd have to go peruse my manual again, but I'm sure it doesn't say 10 volts, probably 10 amps. If you only put a 10V source into the 12V battery it would never charge at all.
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Old 12-21-2004, 04:45 PM   #11
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Quote:
Originally Posted by djennison
I disagree with that statement. The OE panasonic batterie is from 1970 pratically. Look at it, its SO old school.

If you read your manual, it clearly says NOT to charge your OE Panasonic batterie higher than 10 volts!!!! So putting a "special" charger at a higher setting goes against what your manual says to do, if you run into a dead batterie.

I read my manual.
You are clearly

Old school worked just fine for five years. That is, it started my car everytime until today, so yeah it may be "Old School" and it required a little distilled water every year or so but it worked fine.

For your edification a 12V car battery will not charge at 10V because it's not enough pressure to push any current through the plates and will never reach full charge which is 12.65 to 12.9 VDC depending on the battery type. Your alternator charges the battery at 14.5 to 15V everytime you start your car and then settles down to 13+V as the surface charge builds. That's how it works.

The special charger I was referring to is the so called "Smart Charger" type that automatically adjusts voltage and amperage to charge a severely discharged battery without damaging it. They work great on old and new types of batteries. BTW I replaced my dead battery with a $49.95 MF battery so it's "New School" now.
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Old 12-21-2004, 07:06 PM   #12
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Awe.. that was a typo. But it does say not to do charge it any higher than 10 something. Anyways, I dont care for the OE batterie. The less I have to worry about, the better. My OE batterie only lasted 1 year 24k in miles and was DEAD.


Dont get me wrong, I dont care what type of batterie is used, but if your going to by a new car, you would think they might offer you "todays" batterie technology. I mean, its been some time since Ive had to add water to my batterie. And being my OE panasonic left me stranded in the rain, is the main reason I made a poke at the quality of it.
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Old 12-21-2004, 09:16 PM   #13
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One year does really suck.
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Old 12-21-2004, 10:26 PM   #14
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will subaru cover under warrenty if i have an aftermarket stereo? nothing crazy tho. and the stereo was not the cause for this.
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Old 12-22-2004, 12:08 AM   #15
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Quote:
Originally Posted by 949
will subaru cover under warrenty if i have an aftermarket stereo? nothing crazy tho. and the stereo was not the cause for this.
depends, what are we talking about here? A HU or a full on 4000w amp pushing 2 brahmas?
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Old 12-23-2004, 01:26 AM   #16
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only hu and the stock 4 speakers in the doors. the power loss was cuase i left the dome and trunk light on. that is how it died.
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Old 12-23-2004, 11:43 AM   #17
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Yeah, they'll probably cover it.
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Old 12-23-2004, 06:04 PM   #18
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the stock battery is garbage..I have 6000 miles on my wrx and the battery has a hard time starting the car on 25 and below degree days. I ordered a Red Top Optima last week from TNA-Sports..Do and yourself a favor and just get the Optima and be done with it. Even it Subaru replaces the battery you are still going to have a crappy battery, especially if you decide to expand your car stereo system.
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Old 12-23-2004, 07:42 PM   #19
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as a general rule, lead acid batteries do not respond well to deep discharges. The stock battery is just fine - as long as you maintain the electrolyte levels (it is not a maintenance free battery - just keep the fluid levels between the low and high mark with distilled water), it should last a while. If the battery is old (3yrs or so) I would say just replace it - better to do it at your convenience, rather than when it can no longer start your car. If it's relatively new, then I would just drive around a while and see how it does.
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Old 12-23-2004, 07:50 PM   #20
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Quote:
Originally Posted by djennison
If you read your manual, it clearly says NOT to charge your OE Panasonic batterie higher than 10 volts!!!!


count the cells in the battery - there are 6. lead acid cells are a little over 2V a cell fully charged... they do call it a 12V battery for a reason... the alternator applies somewhere around 14.5 volts (give or take a little) to the battery when charging.
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