[David]

Salvo solder there packs together.
so before everyone tells you you need to weld them.
yes they solder none taged batteries.

best way ive found is to grind the top and bottem with a dremel just enought to rough up surface. This seems to help solder run / flow.

all the books and information around tells you that the heat form soldering will damage battries. If I were cave diving I would want a welded battery pack or one I had used a few times to make sure it was good.

David