Lately, I've been stacking multiple (3+) 6mm rare earth metal battery spacers to put 18500 batteries in my SS GGTS that's configured with a SS (or brass) GG stealth cap connector in between the base and the top tube to preserve that clean flush look that the telescope can sometimes interrupt. Is stacking magnetic spacers safe? Is it any less safe at 6 or 7.4v vaping?