I never had issues with batteries in cold weather, but when I lived in Phoenix, I would go through a battery every 2-3 years. That was back in the 90's when cars had very few computers. When I moved back to Idaho, I bought a 2008 Toyota Tundra. I replaced the factory battery in 2021, the day before I sold it because the dealer said it was starting to go bad. That said, I am going to replace my factory battery with an AGM H8 as soon as it starts acting up. Based on the posts here, it's not worth my time to get the battery replaced under warranty.