Quoted from BadBrad97:I used to solder Ni-Cad battery cells together all the time building battery packs for racing radio controlled cars. Never had a problem. Not sure how else you would build a battery pack, unless you had a tack welder. The new guys are building Li-Po packs the same way now.
Me too! In fact, all of my soldering skills came from my RC racing days (used deans plugs for a connector on a remote battery holder on an old pin ). I didn't bat an eye at the site of soldering the battery directly.