So I purchased my 1000 mah black ego c twist battery on Thursday and was told to use it with the factory charge until it died before charging it. Well, it is Saturday night and it hasn't died yet. Granted, I haven't been vaping that heavily as I don't like the juices he sold me ( the menthol tastes like a Halls and the cappuccino like cookie) but still. How long should the factory charge last? Should I really keep using it til it dies before charging it?