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I couldn't get continuity with the battery until I trimmed back a plastic protrusion near the positive contact. The protrusion was intended to prevent continuity if the battery was installed backwards. It was a simple matter to trim it back with a knife.
I had no trouble soldering. Bend the tab out, and keep the iron at the tip of the tab, and use small wire.
Not only does this battery holder melt easily (almost immediately when soldering leads to it), it is also hard to mount. Comes with two small holes to screw screws through, but even with flat head screws, it seems to be in the way of the battery, thus pushing it out and not holding it properly.
To solder faster, apply a small amount of liquid flux to wire and tab. Attach wire to tab, apply a small amount of solder to iron and with solder ready, touch iron to tab instantly applying solder to tab also. I have had this melting problem on ckt. brds and this is a useful technique. Good Luck.
I was using this holder while breadboarding some LED circuits (connected with alligator clips)and after a short while found that it had a fault in the rivet to the negative terminal. Knowing full well from other reviews how sensitive this is to heat, I carefully attempted to solder a thin wire to the terminal. The surrounding plastic melted almost immediately. I would reccomend you find another battery clip to use, this one is worthless.