Registered
Join Date: Oct 2005
Location: Birthplace of Bix
Posts: 1,145
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Sounds like a short in the plates - Optima batteries have a spiral plate design and two layers of lead sheeting could somehow be touching each other due to a manufacturing defect. That would cause the gassing and smell you described plus kill the battery over time.
You can check the voltage at the battery terminals with the engine running and it should be about 14 volts.
Joe
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Joe
85 Carrera
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