The 2 year old Silverado, does not have the stop start feature, GM
does have that in some of the mid and smaller Suv's now. Not the full
size models. With a 2 year old battery, I would have taken it back to
the dealer, there would have been full free replacement or very little charge.
I'm thinking it would have been covered by the 3 yr. 36,000 wty.