Buy a deans battery jig there not exspensive but i have one and they make building cells so much easier. I find the easies way is to sand the + and - of the cell a touch then use multicore solder and hold your iron over the terminal not touching and just put loads of solder on the tip until it drops onto the terminal then just hold the bar on and put the iron on top and wait give it a few seconds to push its self down on to the cell.
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