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m78 · Posted: Tue Apr 01, 2008 3:33 pm Post subject:

I might be wrong, but I believe that there is a power depletion threshold at which a battery can no longer be jump started.

In other words it may be too dead to be jumped.

can someone else confirm or deny that?
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Lachssilber Metallic 203 1988 325i sedan with 200,xxx miles

Top Speed 220 km/h

(OO=00=OO)

bimmerjo · Joined: 24 Jun 2006 Posts: 389 Location: Aurora, Mo

I can confirm that.... i ran into it multiple times Rolling Eyes

......
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1988 BMW 635CSi - Black
1988 BMW 325iX - Grey - Soon will be black
1986 BMW 325ES - Black
2008 Kawi ZZR600 - Black
1977 Custom Deluxe - Red

cjhsa · Joined: 10 Jun 2004 Posts: 325 Location: West Michigan

Yep. Replace the battery. Costco has their model 12, which fits E30's and has the hold downs on the end as well as the side, for $52.
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1984 325e 5-speed coupe
Lapis blau

vinleb · Joined: 20 Mar 2007 Posts: 122 Location: Boston North Shore

Walmart has a battery that fits as well for just under $60.00 less core I believe. That's the one I have it fits no problem.

m78 · Posted: Thu Apr 03, 2008 8:15 pm Post subject:

Mine's a international diehard from Sears.

$90 lifetime warranty.

replacements ...no questions asked.
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Lachssilber Metallic 203 1988 325i sedan with 200,xxx miles

Top Speed 220 km/h

(OO=00=OO)

gmore24 · Joined: 23 Jan 2006 Posts: 94 Location: Corsicana, TX

m78, it is very likely that your battery has a bad cell. This can happen when the battery gets too low for too long. It can also be a defective battery. If the battery has a cell that is shorted, it will not jump start because the current from the jumper cables goes through the shorted cell rather than the starter. Current always takes the path of least resistance. I would put money on it that if you took your battery to AutoZone, O'Reilly's, Pep Boys, or some other place that has a battery tester it would fail with a bad cell. Replace the battery and I'll bet you will be fine. Unless my battery goes down because I left the lights on (doh!), I replace it as soon as it lets me down the first time, or when I notice that it doesn't spin the motor quite as fast when starting. Its cheaper to replace the battery, even if the "life" hasn't technically expired than to be stranded. It amazes me that we replace timing belts, water pumps, brakes, hoses, fluids, and the like before they fail but wait until we have to have our car jump started several times before replacing the battery! I say we because I have done that myself.
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Zu fahren ist zu leben

79 Chevy truck (fuel injected 383!)
87 325iC
89 Ford Probe
92 Cadillac Sedan DeVille

m78 · Posted: Sat Apr 05, 2008 10:09 am Post subject:

I agree completely. That's the advantage to owning a diehard. Free replacements...no questions asked.

But actually it's menuhin that has the bad battery. Not me.
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Lachssilber Metallic 203 1988 325i sedan with 200,xxx miles

Top Speed 220 km/h

(OO=00=OO)

menuhin · Posted: Sat Apr 05, 2008 4:59 pm Post subject: