![Cordless soldering iron made from a resistor](https://i.washerhouse.com/uploads/posts/2019-11/1573467420_1-0-07-29-014.jpg)
You can make a mini cordless soldering iron yourself in literally 15 minutes. Put it in your pocket and go soldering where there is no electricity. The main heating element is a 4.7 Ohm resistor. A 3.7 V 18650 series element is used as a battery. Its capacity is more than enough for a long operating time.
Will need
- Resistor 4.7 Ohm (0.25 W).
- 18650 battery at 3.7 V.
- Momentary button.
- Heat resistant tube.
- A piece of wire.
- A piece of copper wire 0.9 mm in diameter.
Making a mini soldering iron
We take a resistor.
![Cordless soldering iron made from a resistor](https://i.washerhouse.com/uploads/posts/2019-11/1573467494_1-0-00-02-838.jpg)
We wind copper wire around its middle, three turns. If the wire has varnish insulation, it must be removed using acetone or mechanically using sandpaper.
![Cordless soldering iron made from a resistor](https://i.washerhouse.com/uploads/posts/2019-11/1573467447_1-0-01-16-018.jpg)
We press all the turns tightly together with pliers. We bite off one end of the wire closely, and the other at a distance of 0.8-1 cm.
![Cordless soldering iron made from a resistor](https://i.washerhouse.com/uploads/posts/2019-11/1573467450_1-0-01-59-493.jpg)
We take the button and solder the wires to its contactors.
![Cordless soldering iron made from a resistor](https://i.washerhouse.com/uploads/posts/2019-11/1573467492_1-0-03-09-093.jpg)
We bend the contacts and glue it with hot glue to the battery body.
![Cordless soldering iron made from a resistor](https://i.washerhouse.com/uploads/posts/2019-11/1573467398_1-0-03-35-599.jpg)
We put a piece of heat-resistant tube on one leg of the resistor.
![Cordless soldering iron made from a resistor](https://i.washerhouse.com/uploads/posts/2019-11/1573467417_1-0-04-29-068.jpg)
Solder to the battery pole. Polarity doesn't matter.
![Cordless soldering iron made from a resistor](https://i.washerhouse.com/uploads/posts/2019-11/1573467405_1-0-05-08-992.jpg)
We solder a wire to the second terminal, also put on a heat-resistant tube and solder it to the button contact.
![Cordless soldering iron made from a resistor](https://i.washerhouse.com/uploads/posts/2019-11/1573467448_1-0-06-42-667.jpg)
We solder the second lead from the button to the second pole of the battery.
![Cordless soldering iron made from a resistor](https://i.washerhouse.com/uploads/posts/2019-11/1573467430_1-0-07-12-688.jpg)
The soldering iron is ready.
![Cordless soldering iron made from a resistor](https://i.washerhouse.com/uploads/posts/2019-11/1573467420_1-0-07-29-014.jpg)
We press the button. We wait a couple of seconds to warm up.
![Cordless soldering iron made from a resistor](https://i.washerhouse.com/uploads/posts/2019-11/1573467427_1-0-09-06-861.jpg)
And we start soldering.
![Cordless soldering iron made from a resistor](https://i.washerhouse.com/uploads/posts/2019-11/1573467443_1-0-09-43-099.jpg)
This is how easy, quick and simple it is to make a cordless soldering iron for soldering small elements in conditions without electricity.