"those refilling should be careful not to let the liquid reach the battery..."
Yup The wild wild world of
vaping.
I have crippled 2 batts experimenting while refilling.
The carts with the smaller hole take a few drops readily from the batt end.
If you block the mouthpiece the
juice will not go in.. sooo, hold it in your hand and keep it off of a hard surface while dripping.
I drip Greencarts and regular carts with the small hole the same way.
Wait for each drop to do a Mind Freak and vanish or the juice will pool around the threads.
I never take a refill on the road fagetaboutit.
Many of the vids show a fill from the mouthpiece and a good hit after filling.
Refills give good hits at first but there is no way they last like a fresh cart, and I use a bunch more juice for the same result
Sitting at home adding a drop here and there is my personal expectation with a spent cart.
I vape like a muther so your milage my vary.