Hi guys i have a quick question for you. My 1 watt 520nm ple mini from jet lasers is on it's way. It says it takes 2 16340 batteries. I have never owned anything with these batteries before so when I received them I was surprised how small they were. I know the jetlasers house are pretty big even the mini so I'm worried I have the wrong batteries are there different types of 16340 batteries? I just want to be able to use the laser when it arrives.