Sorry to keep pestering you about things, but I have to ask something else. The battery type for the SF501B blue laser is listed as 16340. I've never been familiar with batteries beyond the common D, C, AA, AAA, etc. so this type is new to me. When I google it, I find that it even comes in different voltages such as 3.0, 3.2, 3.7V, etc. I don't want to end up buying the wrong one and do damage to the laser. Which voltage should I buy if I have this laser? Specifically, the 1.5W--1.8W version.