you can leave the battery connected until it needs charged.
Also buying bottles of fluid and topping up carts is alot more reasonable price wise than buying cartridges. You can also get fluid that tastes alot better than carts, but remember it takes a while for your taste buds to get back to normal so hang in there and the flavors will get alot better.
Hi
I've been watching some videos from Dusty and others and see how to put in fresh liquid into my cartridges. This will take me a little while to get used to, I know that but wonder if I can buy the "juice" in the little bottle with the dropper thing, and if so where? Remember I'm in Scotland, U.K