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Originally Posted by 9fourteen
When I hooked it up the charger showed it only had about 6 volts on it.
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914,
I ran into the same problem early this winter. I had no idea that our Boxster had so much draw while just sitting in the garage, and I did not have the battery on a trickle charger.
We know that all lead acid batteries sulfonate if it is drastically discharged and will not hold a charge for long. I looked into this on the PCA website last year and found the following:
12.5 - 12.8 80 - 100% Battery is ok
12.2 - 12.5 50 - 80% Recharge battery
11.6 - 12.2 0 - 50% Low state and recharge immediately
Below 11.6 0 % Battery should be replaced
When I checked my battery at autozone it was much less than 11 volts and therefore sulfonated and not able to hold a charge.... I replaced it. Now is working fine.
I have a sneaking suspicion that your "new" battery was significantly discharged several times and will now not hold a charge. I have heard that a standard battery will tolerate 4 - 5 major discharges before it becomes significantly sulfonated. I am suspicious that this occurred while the car sat on the dealer's lot. I know that was the culprit for my 4 year old battery.
Hope this helps,
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