"Jeff Liebermann" wrote in message
...
On Fri, 11 Dec 2015 21:26:03 -0000, "Ian Field"
wrote:

The flux I bought in a plumbers supply yard works perfectly OK on
stainless,
but sometimes needs the stainless to be lightly abraded.

Paste or liquid flux? I've had no luck soldering stainless with
either. Mostly, I try to solder to button cells, not 18650, which
might be different. The paste flux made for copper pipe doesn't seem
to work for stainless. For example;

Some plumbing is stainless and any good plumber's yard will stock flux for
it.

The one I bought from had regular and active flux - I bought the latter and
it works just fine on stainless.