help with driver/batteries for 2W 445nm

hello, I'm building a 445nm laser and the only part I'm stuck on is the driver. I'll be using a 9mm diode and I'm hoping for at least 2W output, but the more the better. I already have a bunch of ultrafire 18650s so if possible I'd like to use them but if 2 cr123s would be better I can order some. I am using a c5 host so if possible id like a driver that will fit into the same spot as the factory driver. any help you can offer is much appreciated, Thanks!

Making another thread on the same subject is frowned upon here. Just post new questions in your old thread

oh sorry, since i was looking for info on the driver specifically i thought i would get better results posting in the driver section. if any staff member sees this this, feel free to delete it