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Old 01-26-2004, 11:17 AM   #1
Scooby Guru
Member#: 3148
Join Date: Dec 2000
Chapter/Region: TXIC
Location: DFW, TX
2012 Mazdaspeed 3
Crystal White Pearl Mica

Question Dead battery or bad battery

The battery is three years old, so it is probably time to replace, but this struck me as weird.

I still have the stock battery in my car... Yesterday, the car hesitated turning over just briefly as if the batt was low... I thought "This is the beginning of the end." I was right. I went back out this morning at 5am to take Valerie home, and the car would not turn over....

Flash forward to 830am. I pull the battery out of the car. Test the voltage.... 12.5 volts.... strange, that is enough to turn the car over. I check my spare batt (actually the battery for my Integra)... 11.41 volts... I think "Well damn... this isn't good." Having few othe roptions, I drop the Integra batt in the Suby (mind you the teg has a batery about half the size of the Suby batt in physical deminsions).... I think "I am only going to get one crank out of the batt before it is too low to turn the motor..." Turn the key... car starts wothout hesitation.

Question: How can a battery have the voltage from a tester (12.5v) to start the car yet not?

I am thinking the battery may have a bad cell or something... the Teg battery has only bee used to start the other car like 5 times... so it is practically brand new....

Am I too far off base with my possible solution?
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Old 01-26-2004, 11:24 AM   #2
Scooby Specialist
Member#: 16820
Join Date: Mar 2002
Chapter/Region: TXIC
Location: east dallas
88 535i


voltage probably drops a bunch when under load, hence no start
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