So I bought a few 510 carto's to try and with the help of a few here figured out how to fill them. My question is this is only for when I am out and about I drip or use carts most of time, being that I am not going to completely empty this in one sitting if I want to top it off how do you know how much to put in? Do you just fill slowly till you see a drop forming on the battery end?
Thank You
Thank You