Direct from China, but which battery?

Wotcha chaps,

Just bought one of these..

High Power 405nm Purple Blue Violet Laser Pointers Focusable Burning Black Match/Cigarettes Uv Counterfeit Detector,High Power Laser Pointer Uk High Power Laser Pointers For Sale From Powerful2015, $12.07| Dhgate.Com

No I don't think it is going to be 5W either however thought I'd give it a whirl.

Trouble is it has arrived with no packaging or info. The ad says it takes a 16340 but these seem to come in several different sizes and even voltages.

Will I get more power out of it with a higher voltage and does it really matter which 16340 I buy to put in it?

I think it's going to be 60-100mw. 200mw max
There's no 5W 405 diodes. Most powerful right now is 1W

And the battery? Anything labelled 16340 or do I need a specific voltage?

Any 16340. And one only. 2 will kill it.

Cheers dude.