I want to use a 3.7v lithium-polymer battery to power a esp8266 wifi module in a mechatronic project. This module works with 3.3v and I'm not an electronic expert so I use modules to avoid mistakes and time saving. Despite the fact that it looks like a pretty common problem, I can't find any module to buy. I don't know anything about circuit design but I can learn. So I'm looking for any cheap solution for this problem.
to power this: