Question about esp32 battery connection

So I’m planning to use a 3.7V LiPo battery to power an esp32 project. I’m confused on whether or not connecting it to the 3.3v pin is a good idea or if I should connect it to a step down converter first. Is it better to use the onboard regulator and will it even work properly or will I fry my board if I don’t use the step-down