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I just ordered a replacement Delco battery for my 2010, which has seen 7 full seasons of driving.
I'm not gonna test a battery that old, just replace it. It still starts but I have been getting some spurious stabilitrac warnings without actual codes.
The vent is due to the battery being in the trunk, which is an enclosed space. Batteries produce hydrogen. Boom!
All batteries that go in the trunk or passenger compartment have a vent tube to the outside.
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