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Unread 08-22-2013, 07:55 AM   #1
jeepgal2k12
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1996 ZJ 
 
Join Date: May 2012
Location: Diberville, ms
Posts: 84
Quick battery question

What charge is a battery supposed to be? If it reads 12.00 on a multimeter is that the correct voltage? Is 12.00 the appropriate charge for some batteries?

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1996 jeep grand cherokee laredo 2wd
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Unread 08-22-2013, 07:59 AM   #2
zj97ltd
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Most any one I've ever had would test ~12.5-12.7 with the vehicle off. Then low 13's while running. The "12V" terminology is kind of a misnomer.
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Unread 08-22-2013, 08:28 AM   #3
jeepgal2k12
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Thanks! All I needed to know.

I told the guy at advanced my battery only read 12.3-12.4. He looked at me like I had two heads and told me it was only needed to be 12v. I was starting to think I was crazy for a minute.
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Unread 08-22-2013, 08:37 AM   #4
zj97ltd
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Around here it's a real crap shoot trying to get knowledge behind the counter at a parts store. They only know what their computer tells them, which isn't much.
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Unread 08-22-2013, 08:51 AM   #5
JeepNicholson
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Quote:
Originally Posted by zj97ltd View Post
Around here it's a real crap shoot trying to get knowledge behind the counter at a parts store. They only know what their computer tells them, which isn't much.
Yep, generally if they were mechanics, they wouldn't be working there, though sometimes you get the occasional retiree mechanic working there, but that's rare
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Unread 08-29-2013, 06:56 AM   #6
jeepgal2k12
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Location: Diberville, ms
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Ok only question. I've gone to two part stores to have my battery test. One says my battery is fine (where I bought the battery. The other says my battery is bad.

I got my battery charged yesterday morning. By the time I picked it up and did some work on my car it was too dark. I just reinstalled it this morning, and it was dead again.

It lost its charged not hooked up to anything.

Bad battery or normal?

I promise I googled this...
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1996 jeep grand cherokee laredo 2wd
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Unread 08-29-2013, 07:10 AM   #7
zjosh93
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If it lost the charge not hooked up to anything it's probably bad. Either it isn't taking a full charge or it has an internal short and is discharging overnight. If you have a warranty you would like the store you bought it from to honor you can have them charge it and hold it for you overnight. If it's dead in the morning they should warranty it out. Or you could just dump out the acid and refill it with water, instant "bad" battery.

FWIW when I sold parts the minimum for a fully charged battery was 12.45 volts. The problem is that voltage isn't a very good measurement of a battery's charge.
http://batteryuniversity.com/learn/a...tate_of_charge
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Unread 08-29-2013, 10:43 AM   #8
jeepgal2k12
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Battery turned out to be good, but I think I see what the problem is. Thanks all!
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Unread 08-29-2013, 12:57 PM   #9
PolkaPower
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12v is about 50% charged. Charging it half way will ruin the battery. It needs to be put on a trickle charger overnight and charged slow. Fast charges can also ruin a battery. Running it low like that will cause it not to hold a full charge and it will lead to sulfation over time.

Mine right now is showing signs of sulfation. I let the battery totally die a couple of times and in my ignorance I didn't charge it fully. Now it won't hold a full charge and it's slowly dying. It won't make it past another winter. The ZJ hates low batteries too.
http://batteryuniversity.com/learn/a...to_prevent_it/
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