Over time you may notice a nick or a tear in the batteries that you use in your vaping device/mod This is not a good thing, especially if you are using a mechanical device as you run the wrist of a 'hard short' or 'short circuit' should the uncovered part of the battery touch any other metal.
The wrap on a battery is basically ensuring that the 'negative' portion of the battery (which is all of the battery apart from the 'positive' terminal) is protected from this 'positive' terminal. You will also notice there is an insulator that surrounds the 'positive' and you must ensure that this remains in place when attempting to rewrap you battery.
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