Help needed for DIY green laser

It's been a while since I've made a laser and I got a good idea for a DIY green laser. But I need a little help.

I'm thinking about using this module :

Rayfoss

Is it good?

And also I need some 3V rechargeable batteries, 14500 AA size, but all I'm finding are 3.7V batteries. Can I use a LM317 chip to lower the voltage?

Thanks in advance.

Cr2,cr123 on DX

To large for the host. The best format is 14500 (AA)