Don't hold the wire down with your finger while you're soldering it.
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Don't hold the wire down with your finger while you're soldering it.
Just about any form of heating element is a resistor. For real simplicity a resistor opposes current flow so when we pass current through a resistance we can get a bi product of heat. How much heat is a function of the resistance and current, how much current is a function of the battery voltage and its ability to deliver current. The lower the resistance the higher the current for a given voltage. The higher the current the more heat and the quicker the battery dies. A single small resistor is not practical as you get one tiny hot spot smaller than a toenail.
There is no easy way for anyone to say run out and buy a 10 Ohm 2 watt resistor and power it with.... Things just don't work that way. The problem with creating heat from electricity is that it is not very efficient leading to a need for a large battery.
Ron