It has a coated insert to shield in opposition to shorts in case you experienced injury on your battery wrap, but you should Normally inspect your batteries in advance of using and make sure the wrap isn’t weakened. If it is you need to rewrap it, Online video ranjen617 explained: https://cruzgxjaq.blog2freedom.com/35058213/the-5-second-trick-for-where-to-buy-vapes-online-under-18