Guys, I have some helmet molds (Classic and Berserker). As I myself do, all the aesthetics and mechanics of them are on my account. I try to hide as much of things as possible, the wires and lights are easy. But the battery for the same ones are difficult! I use 9 volt batteries, for 3 volt leds. A battery for the three LEDs, but it is very sturdy and great. It just leaves the inside of the mask with a half 'amateur' aesthetic. And I like a good finish, professional level or closer to that. My helmets are fiberglass and resin, not even 2cm thick. What do I do? Any suggestion?