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
Originally Posted by
JGruber
That's some good information right there. I've had the same problem, and would always get upset cause the solder joints look like crap!
I'll have to try that technique on my next pack and see how it does.