I am sitting in the dealership now because of low voltage on both my batteries in my Silverado 2500 HD. One battery was replaced 9 months ago. The other was replaced two years ago. Delco was great when it was manufactured solely in the US. Now, because of the globalization scam, Delco batteries are unreliable, and you get screwed on the price. I will definitely be looking for another battery manufacturer, especially one that made in the US.
Recommendation: Do your research, buy only American made