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You usually get a pretty good warranty with the Battery Tender, so I would look into that.
I have never had a problem with the Soneil charger. It is not cheap, but neither was your Corvette! The peace of mind knowing that your vehicle is being kept at a proper charge without danger of damage is good enough for me! Use the cigarette lighter accessory socket for very easy attachment and you have a solution to long winter, snowy salty road days!