Just for reference, I recently replaced the battery in my '16 Tahoe with a new AGM from O'Reilly's. They would have installed it free, but the Tahoe was dead in my garage. I wrench a good bit, so I didn't mind doing it myself. Anyhow, with tax, the battery was $280 or so, and took maybe 20 minutes to R&R. It's a heavy battery, and has to be turned on its end, and side, in order to "roll" it out of, and back into, the battery tray. There are 3 bolts and 2 struts to be removed, and then one more hold-down bolt holding the base of the battery. I have all sorts of sockets and extensions, so it was no trouble for me. But I would not recommend it as a DIY chore for anyone who does not have proper tools, or who is not physically able to wrestle with a 40 lb battery into its proper place. The old battery was also from O'Reilly's. It had a 3-year warranty, and it lasted 3 years.