I got a Pixel 3a (released in 2018) back in early 2022. It was “used” but like new. I put CalyxOS on it, which probably helped improve battery life, but I use my phone so little that, at the height of my phone use, it lasted 3-4 days. When reddit killed third-party apps and I couldn’t use RiF any more, battery life went up to 5-7 days. My most-used app is the clock because I use the stop watch to time my breaks at the gym. Nowadays, it’s more around 3-5 days because the battery is slowly losing capacity, but that’s still pretty good compared to what I hear from other people who use their phone all day.