I'm still a noob here (day 13) so please forgive my ignorance. One of my first purchases was a Zmax V3. At this point I barely know how to turn it on. No worries, I'll learn it as I go. But my only complaint is it's size/heft with the 18650 battery so I'm considering ordering smaller 18350 batteries. Again, I'm clueless. Can someone recommend the proper battery so I don't waste money on junk?