The only thing I have to add is that when I do mine I like to put the iron on my plug while I am holding it with pliers until the solder on the plug has been melted for several seconds. This seems to reduce the amount of time I have to hold the iron on the plug on the battery before the plug/solder/battery has made a solid connection. I like to color code (read idiot proof) my plugs with red and black sharpie before I solder. I scuff all the shiny stuff off with a dremel before I solder and then mark all over it with appropriate color after its attached to the battery. I have fried too many speedos by being unobservant.
"Whether you think you can, or think you can't, you're right." -Henry Ford
"[Driving] Genius is 1% inspiration, and 99% perspiration" -T.A. Edison
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