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C3 batteries are mounted inside the cabin, not under the hood. You NEED either a sealed non-vented battery like an Optima, or you need to make sure whatever battery you buy is compatible with your vent hoses.
This!! I spent last weekend searching for a battery (Group 75, I believe) with a vent. None of the ones I looked at had the vent even though they were specified for the C3. (Duracell, O'Reilly, Sears). One possibility is the Napa Legend, but they were out. So I ended up getting an Optima Red Top. Starts real good now.