Originally Posted by WailinOnYa

Do you have an adjustable iron, for temperature I mean. I was having this problem too. I just turned up the iron temp and it made it alot easier and the solder flowed much better. I have some IB3800 cells and it also seems that the grade of metals is different form the negative end to the positive button on the opposing side, the texture seems different. I don't know if it has anything to do with it but its just my observation.