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When having the battery replaced in some of my previous vehicles (not Vettes) the installers inserted a small battery in the cigarette lighter before removal, supposedly to save all the settings in memory, software etc. When the time comes for my C7 to get a new battery is this something I need to care or worry about?
Had my battery replaced as part of my Preventive Maintenance program a few months ago. All I had to do was to pay the dealer for the exchange.. 31,000 miles, 3.8 years..
Emissions status also goes to NOT READY for several parameters / sensors any time battery power is interrupted. The car needs to be driven for a while with numerous ignition cycles for the emissions status to show OK. This is only a concern if you live in an area that requires testing. I had this issue on my wife's Trailblazer after a dead battery. Took a week or two to show ready...