http://www.youtube.com/watch?v=I_NU2ruzyc4
this one shows how to solder and theory behind it, problem is its just shows circuit board type of stuff and flexwatts a little different than a circuit board, your dealing with bigger wire.
for flexwatt your going to want to tin the wire and the flexwatt separately before putting them together (see above video about oxidation). it makes sure you have a good connection directly between the wire and flexwatt with no oxidation, as opposed to adding solder after your pushing them together. the bigger wire takes long to heat than circuit board components and we don't need to risk over heating the flex watt and I want to make sure you get the best joint possible.
flexxwatts like a circuit board, heat it too much and it separates easily, so don't leave the iron on it too long
i find when tinning both the flexwatt and the wire, I normally do not need to add anymore solder but sometimes you do
when their both tinned, I put a little flux on the tinned part of the flexwatt, and set the wire on top of that, set the soldering iron on the wire, couple seconds later the iron will push the wire into the flexwatt's tinned puddle and thats it your done, you'll tear the flexxwatt apart before you break that connection.
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