Quote:
Originally Posted by FL911SC
As always, thank you for the replies.
I am picking up on a theme with regards to the battery. Because it is fairly new, (< 36 months) I would like to be sure before replacing it. So here are follow up questions to help all of you, help me.
I do know about a battery showing 12 volts and still being bad, i.e. unable to start a car. However, with the alternator sending 13+ volts to the battery, wouldn't I see that on my meter when I measured the voltage at the battery terminals? Why would there be a voltage drop at the battery?
I currently use a "Battery Tender Jr." to keep the battery charged while the car is parked. It has always been my understanding that keeping the battery charged prolongs the its life.
Have any of you had a poor experience with one of these chargers?
Joe Bob - you mentioned an analog type charge which might 'refresh' the battery. Would you provide an example?
As for corrosion, that is certainly a possibility. I have checked and don't see any, but admittedly, only looked in the easy to see connections. I will say that the battery terminals are clean.
As always, thank you for your help.
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If you hook up a 15V battery charger to a dead battery reading 1 volt, what do you think the voltmeter would measure at the battery?
Hint: It would be just a tad above 1 volt. Then, assuming the battery can take a charge, it rises slowly to 13.4V or so.
Now, just because the battery shows 13.4 V, it doesn't mean that it can maintain that (ie. amperage is shot)... The moment it gets a load, it falls back to <10v...
A new battery, will put out >12V for over 300 amp/hours. Meaning, you could drive your 911 with no alternator for a couple hours before it went dead... The battery in a 911 is HUMONGOUS.