Which host for my new laser?

Hi

I am a newbie and got this yesterday

445nm 9mm Diode In Copper Module W/2.4A X-Drive & G-2 Glass Lens

https://sites.google.com/site/dtrlpf/home/diodes/9mm-445nm


I need a host, and I am looking at this site.
Host Assemblies

Which one would be the "best"? I can see the S4 offers a extension so I can choose between two short batteries or two 18650.

But I don't know what all the things mean? What should I order?

BR
Steen

If you are looking for something more custom then the S4 then shoot me a PM. I have some one of a kind, one off hosts that are similar to the S4 but youll be the only one to have that exact host. Every one of them is one of a kind so you wont have the "run of the mill" average hosts

Or if you really want something special I have a chrome plated or 14k Gold plated host for sale but those are really special