Continue heating the junction by positioning the iron as previously instructed.
The material in this junction is sufficiently greater in mass than the battery holder, thus it will require more heat to raise it to the correct temperature. Leave the iron in place a little longer than previously, and check how well solder flows when you begin.
Feed solder into the junction.
Check for a cold solder joint. Reflow if necessary.
Tin the tip of the iron and return the iron to its stand.
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