low profile ego-t battery size mod....help

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Okay, so i bought some of those flashlights...the led kind and plan on using those....they glow in the dark and are super cute when it comes to colors (it's a girl thing :))

and anyway, I 've been watching bailey EFT 's videos on youtube on how to make a "detonator" out of those kinds of flashlights......now he uses a regulator...which I think is good that way your voltage doesn't decrease as battery life dies out....but I want to know if its possible to make it a variable voltage as well....??

Also one more thing...are the cr123's the best option for high voltage??? and what is the deal with vent holes...I figured the more sealed up it is the better so you don't screw it up if it gets wet or whatever....but I've been hearing about batteries "venting" what does that mean and which is the best battery that that doesn't happen to?????
 
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