Introduction: How to Make a Soldering Iron With a 6 Volts Battery.

Picture of How to Make a Soldering Iron With a 6 Volts Battery.

Hi, friends!
today i am showing you how to make a soldering iron from a 6v battery.
this is the easier way and the safest method ! it gets hot up-to 60 degree C in only 10 seconds.
here is the picture of it! i consist of two wires + and - .
the blue  and yellow  stuff is your soldering iron and the black wire is the negative terminal.
it's whole cost is only 6 or 7 dollars depending on the cost of battery!  and if you have a 6 or more volts battery then the expense will be reduced to only 4 dollars or 20 indian rupees! it's very very affordable!

Step 1: Stuff You Need

Picture of Stuff You Need

The stuff  you will need is very cheap and easily available at any corner shop!
1. A Pencil. ( a common HB pencil. you have to remove it's wooden casing and  take out a long graphite from it. )

2. A sketch pen .  ( cut it half )

3. An  hollow  iron tube . ( the iron tube should be selected in a manner that the graphite lead can be easily inserted and can hold it tightly. )

4. Two long wires ( you can  increase or decrease it's length as per your need or availability. And the wire slould be thick enough 0.75mm so that it can hold the current passing from it.)

5. a 6 or 12 volt battery ( a 6 volts battery is good enough to make this but don't use any direct power supply it will decrease it's performance.  )

6 . A good quality paper. ( don't use a magazine paper use a simple rough and good quality paper like a times news paper. )

5. tools pliers , tapes ( it's good to use a head resistant tape. ) , a pair scissors.

               Caution : Don't dare in your dreams to connect it from a common household 220volts ac or dc supply. if you will try to        do this i am not responsible for your death!

Step 2: Making the Soldering Iron's Positive Terminal This Will Become Hot While Soldering!

Picture of Making the Soldering Iron's Positive Terminal This Will Become Hot While Soldering!

1. Take the iron rod and make a dent between it so that the lead gets a base. do it as shown in the photo! no : 01.

2. Now attach a long wire with the iron rod the cover the iron rod with a paper and tape it. as shown in fig no : 02. part 1 and part 2.
    ( note: the paper is used in order to protect the tape from burning cause the iron rod get's very hot when soldering . and paper is very bad conductor of heat. (it's insulator)  ).

3. Now take the sketch body and insert the whole thing you have made in it . as shown in fig . 3 part 1 & part 2. ( it's the casing. )
           ( you may need to cut the wire like in fig 3  part 2. to insert  the stuff in the casing. )
4. Now your solder is ready. just connect the wire coming out from the solder to the positive side of the battery. (you can use capacitors for better performance.)

5. so, now you will be confused about the negative terminal. i may tell that the negative terminal is also used. just attach a long wire to the negative terminal then touch the neg. terminal coming out from the battery to the graphite of the positive terminal and the lead will start getting hot you will see some smoke coming out from the lead when you use it first time. after one time it will not be again repeated with the same lead you can also change the lead time to time for better performance.

6. THIS SOLDERING IRON CAN BE USED BY ONLY TOUCHING the the lead with the neg. terminal.

7.   now your soldering iron is ready in a cheap manner. can see the whole setup's picture in fig 4. part1 and 2
-----------------------------------------------------AUTHOR TIPS -------------------------------------------------------

THE lead becomes hot on passing electricity cause the lead between the terminal is a semiconducter (graphite).

It get's hot in only 10 - 20 seconds. (depending on the charge of the battery)

You can use a heat resistant tape for better heat protection.

it's so easy cause i (a 14 years old child can make it.).

for any type of help on this topic or another you can mail me at ""
or just comment.

Thanks for reading.

Step 3: The Finished Product

Picture of The Finished Product

Here's the image of the complete soldering iron!


DebobrataS (author)2015-01-06

Where do I find a hollow iron tube that small?!?!

akshat maurya (author)DebobrataS2016-05-01

I think that you should get one from a paint brush it has one

JaykishenK (author)2016-03-05

Hello can i use my phone charger which can give output upto 1A and 5V

RamcharitmanasS (author)2016-02-28

wonderful i tried

Adarsh_tronix (author)2013-01-12

Good! but hey man,4 dollars is not equal to 20 Rupees like you said.One dollar is about 55 Indian Rupees.Do the math.


samaddon (author)Adarsh_tronix2013-01-12

Hello Sir and thanks for commenting! first i am not a man cause i am only 15 ! and I may tell you if you are going to buy the required stuff in india for this project it will cost you around 20 rupees cause i live in india and if you are going to buy one from u.s it will cost around 4 dollars cause i am familiar with these countries !

jtyler17 (author)samaddon2015-07-17

U said u were 17 then u said u r 15

kevanchristian (author)jtyler172015-08-13

in the instructable he's 14

King Cyber (author)2016-02-08

man i love i saved cash for buying a soldering machine then i saw your project ,, i ws so happy to it cause i had items to make it in my garage thank you bro

JStuyfzand (author)2015-10-23

I made myself one too, the only difference is that I used a 16A power supply, gets white hot in 20 seconds, might make an instructable on it!

daniel.hutchinson.1257 (author)2015-08-18

Why cant i use a 9VT battery? And it their a substitute for the iron tube

No a v battery actually dosen't have that much amps or in simple words that much power to heat a graphite rod , it just cant supply that much amps , many of you think that it's nine volts which greater than six volts so it can do but you also need to know about the current , so learn a little about current and electricity before trying to make any of this

kevanchristian (author)2015-08-13

can you do a picture of soldering something with it?

davuk (author)2015-07-06

your soldering iron machine is not heat when i made iti choose adapter of 6 volt but they can't work

manny123007 (author)2015-06-26

hey kid can u make a proper schematic for yr project ....
its too boring to read all instructions :P...

samaddon (author)manny1230072015-06-27

Do i look like kid? okay yes i do but i am 17 , and there's no schematic you just need to connect the battery and graphite rod in series!

simba1 (author)2015-06-09

Very nice instructables!!! But can we use other battteries except 6 or 12 volt batteries maybe some AA batteries connected

ankit.agrawal.311493 (author)2015-03-30

For how much you got the 6v battery in india?
Can i use silver foil instead of paper?

Nope paper is for therman insulation. And a 6V battery is about 350INR.

ThopegowdaY (author)2015-05-08

nice and cool.i will try making it .but i did not find a hollow tube can i use from an aluminium can

hkumar28 (author)2015-03-27

Here is my solder

samaddon (author)hkumar282015-03-27

it will never get that hot with a battery so low on amps you need a battery with high amps dude!

simba1 (author)samaddon2015-03-29

how many amps does it require??????

samaddon (author)simba12015-03-30

Never measured it though!

samaddon (author)simba12015-03-30

Around 1A @ 6volts!

sizzic (author)2014-10-28

could you use a 9 volt battery?

samaddon (author)sizzic2015-03-27


hkumar28 (author)2015-03-27

I tried to make it
But my graphite is not getting enough hot to melt the soldering wire
I am using a
9v battery

JohnD16 (author)2014-11-23

dose it half to be metal or can it be a pencil casing with tin foil

Quantum-Physics (author)JohnD162014-11-26

could you be a little more specific on your words??

NisargIngole (author)2014-09-22

4 dollars isn't 20 indian rupees but almost 270 indian rupees

alexx22 (author)2014-09-05

Thanks for sharing your idea :D I will try to make one for uotdoor soldering.

Muksam Limboo (author)2014-01-29

can we use 5volt mobile charger instead of 6volt battery??

Muksam Limboo (author)2014-01-29

can we use 5volt mobile charger instead of 6volt battery??

smiri (author)2014-01-20

Good Job!!

pranjal2 (author)2014-01-16

can i use aluminium rod instead of iron rod??

kishore136 (author)2013-09-28

can we use a 9vt 20rs battery??
wat do u mean by neg??

samaddon (author)kishore1362014-01-16

by neg i mean negative . Now about the batteries you can use a 6v 2000mah battery.

muddog15 (author)2014-01-16

Guys.. Shorting out battery's is dangerous. A man changing out his smoke alarm battery's lost his house because he put all the battery's in bag for recycling, and the terminals on the battery's touched and within 30 minutes his house was in flames. This is not safe people, don't do it.

samaddon (author)muddog152014-01-16


The batteries are connected with a load having very high resistance (graphite) so tell me where iam shorting those batteries??

But thanks for you concern.

pranjal2 (author)2014-01-14

do u think it will work to solder wires like real solders??

kishore136 (author)2013-09-28

can i buy a mechanical pencil's refill (5mm) bcoz i cudnt take the lead out form the pencil.i tried it many times.

asdk (author)2013-08-28


pober (author)2013-03-10

will this work if i use a power transformer? like 220 to 12 volt, will that be save? and what if i use 4 1.5 volt battery's?

samaddon (author)pober2013-03-10

Using it with a transformer is a better with cause it serves more Amps but the transformer will get hot i you will use for along time. And how come you got a 41.5 volts battery did you connected the in series if so it's not that safe for the battery's life and if this battery came assembled from the factory you did not connected them in series by yourself then you can use the but i really say don't use a high voltage cause it's dangerous the Lead can blow off hurting you . I must prefer you to use a a 6v to 19 volts batter with good amps but not much amps.

Adarsh_tronix (author)2013-01-13

Hey buddy FYI I'm 15 years and from India too!And I knew that you were 15 yrs old and though, I called you a "man" cuz you've got the brains of a grownup.And sorry for that misunderstanding I though when you went " the expense will be reduced to only 4 dollars or 20 indian rupees!"you actually believed that 4 $=20 Rs.So,all clear now?and keep up the good job and BTW don't call your peers"sir"!

J-Five (author)2012-11-03

Pure Genius!!!!

samaddon (author)J-Five2012-11-03

Thanks ! for commenting!

J-Five (author)samaddon2012-11-06

Very resourceful!!!

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