I came prepared today for vaping all day day at work. I have my charger, extra battery & juice. I'm curious how often you need to top off a cart while vaping. I don't vape constantly, but I pick it up every 30 minutes or so and grab a few pulls. I made the mistake yesterday of allowing the filling to dry up a bit and got a nasty burnt taste that I couldn't get rid of until I changed out the cart. I've been adding 2-4 drops at a time to the old cart once I notice any flavor change, and that seems to be working. I'm not sure how much juice I really need to have to keep me going without running out. I purchased a 10ml bottle and it doesn't seem like I've put much of a dent in it over the course of 24hrs. How much juice do you guys go through in a day? I was smoking close to a pack a day of analogs. Today, I've had a total of 1