I bought a dedicated soldering iron 80W just for doing subC cells. For smaller cells you probably only need a 40W. Be careful not to overheat the cells, don't have the iron on them for more than 2 secs - if you need to your iron is not big enough.
Hammerhead soldering iron tip is necessary if you want to make end-to-end soldering for stick packs... but the biggest drawback is its bloody impossible to un-solder the cells again afterwards (various reasons).
Buy tabbed cells and its much easier.
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