Review on 💡 Anmbest Constant Current CC CV Buck Converter Module - 1.2-36V 20A 300W Power Supply with Short Circuit Protection by Logan Broadnax

That's a great little thing. It converts a current source that would otherwise shut down into a regulated current source with a voltage limiter. This is exactly what I need to charge a lithium battery. It has trimmers for adjusting current and voltage and even a tiny on/off switch. You must be careful when tightening the input and output screws as the terminal blocks are not well secured to the board. I installed it by screwing two self-tapping screws into one of the electrically isolated heatsinks instead of using the PCB mounting holes. I also added an opto-isolator in parallel with the switch to allow for remote shutdown. However, it is a bit unstable and needs some tension for headroom. Also note the 300W limit.