Hey, so I'm building my first handheld laser soon. I ordered an Oclaro 700mW 638 Diode from DTR, I plan on doing this build in an Altoids tin, and I had a few questions. First off, will I need a heatsink? Second, what voltage battery would be best for this? Thank you all in advance, you guys have been so helpful to me while I'm working on this project!