I was vaping one of my menthols earlier, and it lost a little flavor, still had taste, but lost its flavor, then i popped a new battery on because i knew the one i was using was close to dead. Took a big wack off it, and it burned the hell out of my throat. Is there a way other than taste that you can tell a cartomizer is empty? I looked under the drip tip at the polyfill and noticed it looked pretty dry, but unsure... Noobie question