I have a Ameravape Manhattan copper mod with a Plume Vale tank running a .2 ohm coil. My battery is a 18650 3.7v 2500mah. I have two of these which I rotate. One of them would fire really weak and I would get less flavor, throat hit, and vapor. But it was only with one of the batteries the other was fine. So I went to my local cape shop and they could find anything wrong with the battery so I just bought a new one and threw the other out. Problem now is the other battery that was perfectly fine before is now giving me weak hits and the other new one fires fine. I've taken my mod apart and tweaked with it. I just don't understand why one battery is firing weak when they're the same exact battery?? Any help would be greatly appreciated! Thanks in advance!