Check for corrosion in and around the pole and spring on the end cap. The one I bought from another vendor had corrosion on the spring inn the inside of the little well on the negative post. It was impossible for me to sand the corrosion off the spring so I just yanked out the spring completely. While I was in there, I also sanded off the chrome at any place where the battery would make contact. The corrosion itself will look a little bit like rust. My button before I removed the spring got uncomfortably hot whenever I used any coil below 1.7ohms. I still have a little bit of residual corrosion in the well but it no longer gets even remotely close to the old temperature.
