Wow - I couldn't believe my eyes when I read that you said they vaped 'cold'. I have always found a great, warm vape coming from mine. I've only ever used them on my Ego batts which, as you know, run at 3.2 - 3.3 V loaded. Don't know if that makes the difference or not. They do hold an amazing amount of juice though. I usually find that a brand new one will hold anywhere from 30 - 40 drops. And I do probably use them a tad past their 'best before' date and find the longer you use them, the more often you need to top them up. Been babying these though while waiting for the new shipment to come in. I love them because they are dirt easy to use, have always given me more than enough vapor, TH and flavor to satisfy. But, of course, we all have our favs. Hope these land up working for you, Dusty, to your satisfaction.