Hey guys, I've been vaping consistently for about 2 years now. Never before have I come across a problem like this one. I have an asmodus 80w single battery box mod, with a falcon king tank. I vape at 70 watts. Lately, I've stopped getting great vapor production out of it, and my first thought that I needed a new mod. But when I went home to get cash to go to the shop and get a new one, I switched the battery and it suddenly went back to normal! I have 4 batteries, 2 RadioShack 2500 mAh batteries, one Jimren 3500, and a brand new one I just bought a couple days ago. Now all of them except one of the 2500s have this problem. I bought a new charger, still nothing. The one battery works great, the other 3 not so much. What am I doing wrong here? And why is the brand new battery also acting up?