Just a question about staying safe. When I go on a night out, I vape a lot and a lot of the time my battery runs out before the end of the night even though I start fully charged. I usually try and save battery by keeping the wattage and temp down but I dont feel im getting what I need from it. So I want to take a spare battery out with me, but all ive got is the plastic case which is quite bulky in my pocket. So ideally, I'd like to keep the spare battery in my pocket but not in any big casing. What would be the safest way to do this, because I obviously I dont want it loose in my pocket next to my change and keys. Is there something I can wrap it in?