I don't know if it's going to work to drip in the battery end.
This is the big, whistle tip carto, correct? When you fill them you remove two mouth pieces then you get the needle and puncture some sort of membrane and then fill the carto with
juice. If you're filling it from the battery end, you aren't puncturing that film or membrane. I'm not sure if they will make a difference or not when it comes to
vaping. It might or it might not, I'm not sure.
I'm not sure if it's 20 or 30 drops per ml. Something like that.
If you don't want to go to walmart, there are a couple vendors in Tx that would probably ship fast. I just checked BreezySmokes but they don't have them.