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+1 on the advice given so far. I would add that you should also use a quality rosin core solder and not acid core. Acid core flux can promote corrosion of the battery connection. I have made multiple pack configurations with 6 and 7 cell packs for rc cars and as long as you are careful, minimize the amount of heat the cells endure (hence the need for a hot iron), and use quality wire and gold battery bars you will be successful.
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