Tried these and disappointed. No way near Boge LR cartos. Have to wait longer for decent cartos holding at least 1 ml liquid and match Boge LR performance.
I have used them at 3.7V - 5V and beyond and just love them. What don't you like about them? Did you put enough liquid in? They hold a lot.
I just got mine and the carto works great with short 510 buttery but produce a very liittle vapor/taste with 5+V PT. Kinda disappointing. And doesn't works at all with 808 batt+adapter and with PT & 1A usb AC wall charger.3.7 is fine, but you can crank them up if you like all the way to 6+. Just get better and better.
About how many drops will they hold? We put in 45 for starters...