Originally Posted by cr250
Here is a link
for good hints on soldering battery packs. Their work is second to none.
I think that them saying not to tin the cells or bars is bs... The purpose of soldering is to have solder all around the parts you want to connect together. You don't need to tin the bars, just the cells and then add a little solder on the bar when you solder it on the cell so that it flows all over.
Also grinding is useless with good solder and good soldering iron.
Just buy good solder with silver and a good flux in it (Multicore).