Do not vape it, don't pass go. Also, don't give "hell" to whomever sold it to you unless you a) know for sure it's not user error or a bad battery and b) it's a vendor, which doesn't necessarily have ANYTHIGN to do with QC on a product's MANUFACTURER. That's not a good way to get your device warrantied, be polite.
I'm in agreement that priming is important, and the cotton COULD have ignited if you vaped it without priming it at high wattages. The tank is likely not ruined, but may need extensive cleaning and TBH if I had a tank FLAME at me, and especially if the two came as a kit, you may actually want to send both back, in case it's a connection problem or the tank has a flaw in it causing the problem.
I can't really say what's the case with the information given so far. Your mod may be misfiring, if you didn't buy your batteries from a verifiably decent supplier, you may have rewraps of bad batteries causing problems. If you bought the batteries from a vendor, there is a fair to middling chance that they may be rewraps as vendors really want the highest margins they can get, and may skimp on battery safety, which is usually shortsighted but unfortunately shops don't think "a vaper without a face is an unhappy vaper, and unlikely to purchase any more e--liquid and supplies from me...." I wish they WOULD think like that.
Go to Mooch's blog to find out more about safe batteries for your mod and approved list of vendors:
Mooch's blog | E-Cigarette Forum Always buy original!
If your batteries are reading low now, you MAY have had a slight thermal runaway, and I wouldn't trust the batteries now even if they are authentic. With that said, we need to know what wattage you first fired it at, etc. It sounds like it may not be user error IF you were priming correctly AND this was a sudden happening, in which case I'd return to the brick and mortar you bought it from (unless it was online) and see if they can help you trouble shoot, and either return or repair. I'm surprised you aren't getting much flavor from your coils, but DL does tend to actually be LESS flavorful for me, generally, than a smaller MTL tank. You're inhaling straight into your lungs, though really, it may have more to do with your coils and mod generally, some people don't find much flavor in certain tanks or coils, for whatever reason, than others.
If you bought it online, I would consider returning all of it for a warranty, and to make sure you watch several reviews/tutorials for the device on YouTube (I do that with all my new stuff, not so much for the review, as for me often a video demonstration is worth more than all the words in the manual.
It would be good if you provided a bit more information like has anything changed in your vape, how you were priming (if you were-- flavor can be sacrificed quite a bit if a coil isn't properly primed, especially sub0hm coils which do require a bit more "break in" time than smaller coils. Hope you get things figured out.
Anna
