Originally Posted by
05forfun
I've got some information from other forum. They told me to use higher watt soldering gun(higher than 80 W). It makes sense to use high watt because the negatives generally have larger surface so the heat will dissipate quicker. I think I will buy 100 watt soldering gun to see if it works. But one guy told me he can use 40W to solder cells. well I don't know how he did it
Save your money, a gun is USELESS because it doesn't transfer heat to the work area as efficiently as an iron. I've been soldering batteries for 20 some years using a 40W Weller (I'm on my third one but bought a Hakko 736 which is the best soldering station for the money).
The trick is to keep your iron's tip in good condition by cleaning it and tinning it regularly and often. Oxidation is the worst enemy of soldering and almost everyone that has problems soldering are using a buggered up tip. Radio Shack sells little tins of solder tip cleaner and tinning, these work, use them and you'll be a much better solderer.