Introduction: Free Electric Hand Warmer/Stove

Small nine volt heater. Stop at step three for the case and the battery clip.

Step 1: Tools and Supplies

Supplies:

Ni chrome wire or thick steel wool type thing, different thicknesses and lengths heat differently. Some wire will need more voltage to glow red hot.

9 volt battery w/ metal case

Solder

Some kind of adhesive

Tools:

Soldering iron

Utility knife

Flat head screwdriver

scissors

Step 2: Dissecting the Battery

Use your screwdriver to pry open the top of the battery. Inside the battery are 6 AAAA cells (you need everything but these and the bottom cover).

Step 3: Creating the Heating Element

Cut about 1" of whichever wire you are using and solder both ends onto the contacts on the backside of the top cover of the battery (the picture explains it better). You can also stop here and solder wires onto the contacts to use it as a battery clip and use the case for whatever you like.

Step 4: Install Heater Into Case

Apply your adhesive to the BOTTOM of the battery case and slide in the heating element. Try not to let the wire touch the side of the case. Wait for the adhesive to dry.

Step 5: Finishing Touches

I used the utility knife to poke holes in the side of the case.

Step 6: Testing

To test your hand warmer hook up a fresh 9 volt battery to the leads on the hand warmer. If it works then the wire inside should glow orange. DO NOT LEAVE THE BATTERY ATTACHED TO THE HEATER!!!, by doing that you are shorting out the battery and the battery will begin to heat up. To use your hand warmer attach the battery in pulses until your hand warmer is at desired temperature. If your hand warmer works than it is because the wire is resisting the flow of electricity and giving off heat as a bi product. I am proud to say that this instructable was created using recycled materials! Please do not actually TOUCH the hand warmer while it is hot. This is made so that you can use it as a small stove or warm your hands OVER it. I do not recommend sticking hot metal down your gloves.

Step 7: Thanks and Liability

Thanks for viewing my instructable. I am not liable for any burns or injuries caused by this instructable. I appreciate your ratings and comments and please vote for me in the epilog challenge. And remember to check out my other instructables and keep working to save our planet.
Thanks again.
-Ty

Comments

author
Green gadgets made it! (author)2016-10-20

Well while your at it will also show use how to get 9v battery acid off outer hands :)

author
Xixfas made it! (author)2012-12-10

this isnt a good idea

author
najito made it! (author)2012-07-26

thank you very much

author
hanlin_y made it! (author)2012-02-21

It may be safer for you to use a 5W power resistor and mount it to the metal case. That way, you can control the current with I=V/R. 0.5A is okay for AA batteries.

author
Lectric Wizard made it! (author)2011-11-25

Here's a safer way to do this, get a small 12v bulb such at those used on car interior (dome) lights & wire it to an old 9v battery top as you've done here. Safe & cheap,cheap, cheap ...

author
dog digger made it! (author)2011-01-02

If your worried of explosions (which I doubt) you could use a resistor of the right value.

author
Wesley666 made it! (author)2009-02-19

terrible idea. Shorting a battery can make it explode emphasis on EXPLODE

author
chuckr44 made it! (author)chuckr442010-02-11

I believe all batteries sold in the US are required to have vents to vent gasses outward to prevent "kasplosions". This includes AA, AAA, C, D, and 9v batteries. Older batteries do not have vents, which is probably where you got this idea.

author
NatNoBrains made it! (author)NatNoBrains2010-11-28

!EXPLODE!

author
Wesley666 made it! (author)Wesley6662010-02-11

I still wouldn't trust it...safety concern, but it is a good idea other then that...

author
Wesley666 made it! (author)Wesley6662009-02-19

Oh ya and !EXPLODE! if you didn't get that from above.

author
Derin made it! (author)Derin2009-03-27

¡EXPLODE!

author
ReCreate made it! (author)ReCreate2009-02-22

9-volt battery 101 the 9 volt battery has a thick metal casing,worst case scenario:the battery leaks acid

author
LaxLuvr made it! (author)LaxLuvr2009-02-19

Thats why I said Not emphasis on Not to leave the battery attached to the heater

author
Wesley666 made it! (author)Wesley6662009-02-20

Yes but what if it !EXPLODES! in your hand/glove or anywhere else some might put this.

author
LaxLuvr made it! (author)LaxLuvr2009-02-20

Then I hope you have insurance and/or a spare hand!

author
Wesley666 made it! (author)Wesley6662009-02-20

Unless your a guy and want so warmth down there then you better have another one of those.

author
LaxLuvr made it! (author)LaxLuvr2009-02-21

ROFL!

author
boredinventa made it! (author)2010-02-28

just connect 2 nine volts together with a switch in between faster and easier but be careful because it does get super hot and will burn you very badly if used incorrectly.

author
Shagglepuff made it! (author)2009-10-21

 IMA SCATMAN!

author
BluePhenox made it! (author)BluePhenox2010-01-09

no you aren't

author
Shagglepuff made it! (author)Shagglepuff2010-01-10

 (cries for a while)
WELL YOU'RE NOT REALLY ROB!!!!!!

author
Uforic Invasion made it! (author)Uforic Invasion2009-10-23

I might be one of the only people in this thread that understands this... i feel old... yet wise??

author
fire bat made it! (author)fire bat2010-01-08

your not alone man ^^

author
ThaNorwegianDude made it! (author)ThaNorwegianDude2009-10-22

wtf random :P

author
ThaNorwegianDude made it! (author)2009-09-15

Im 15 too! LOL

author
mm405416 made it! (author)2009-03-09

I realize that this would add cost and detract the ratio of recycled materials, but isn't there some sort of IC you could put in line and would complete the circuit in pulses so that you could leave the battery attached for significantly longer?

author
LaxLuvr made it! (author)LaxLuvr2009-03-09

Thats a good idea but considering I'm 13 and don't know too much about electronics I would have to learn more about electronics if I wanted to do that.

author
dodo91 made it! (author)dodo912009-03-26

im 13 too!

author
theghillieman made it! (author)theghillieman2009-08-05

I am 13 too

author
Markolise made it! (author)Markolise2009-03-26

Research into 555 timers I once saw a guys website that used one of these to power a mini Tesla coil. It used a 555 timer, transformer, 2 9v batteries, and a ceramic capacitor bank. Worked rather well in my opinion :D Just a thought

author
luvit made it! (author)2009-04-24

i once made a hand warmer. i took two 9v batteries and plugged the sockets into each (plus to minus). i did a lot of things during church service when i was young. i don't know why i had two 9v batts at church.

author
conrad2468 made it! (author)conrad24682009-05-29

lol prob for the wireless mics!

author
luvit made it! (author)luvit2009-05-31

in 1986 church mics without wires were unheard of... or it was a mic in need of wires.

author
conrad2468 made it! (author)conrad24682009-05-31

back-n-the-day....ha ha ha ha ha!

author
junits15 made it! (author)2009-02-23

how hot does this actually get? i have made several 3 or 4 watt heaters using resistors, and they aren't shorting the battery.

author
LaxLuvr made it! (author)LaxLuvr2009-02-23

I don't actually know how hot it gets. I like your idea! I have used a resistor to make a putrid stink machine but it was a real pain trying to find one that reached a high temperature, especially when powered by a nine volt battery. I hope this helped to answer your question and if you have any tips on how I could improve my idea I would appreciate them.

author
junits15 made it! (author)junits152009-02-24

to improve it, you could use some nichrome wire it is a much better heating element than the steel wool

author
conrad2468 made it! (author)conrad24682009-05-29

better.......a COIL of nichrome...just make sure its insulated....

author
junits15 made it! (author)junits152009-05-29

exactly

author
sharlston made it! (author)2009-04-25

you can get real hand warmers at hiking shops for £7 or $15 and you light the little sticky of charcoal and put them inside

author
A good name made it! (author)2009-04-16

Well that couldn't at all pose a firehazard.

author
dodo91 made it! (author)2009-03-26

want a hand warmer. i learned this the hard way. like he said, it will short the battery. if you connect two full 9 volts together, they will star to heat up.

author
Hunter4000695 made it! (author)2009-03-10

this could be used as a fire starter. but be careful.

author
backscan made it! (author)2009-03-07

Not sure on how green this is but it's a cool (sorry for the pun) idea but I was wondering if this could be improved by adding something like vegetable oil or a small water bag to the case with the steel wool to act like a heat sync and keep the wire cooler while allowing heat to build up and last longer between on and off time.

author
miiwii3 made it! (author)2009-02-27

P.S battery acid deosn't hurt as bad as you think Its more of a paste than liquid. And sorry about the other comment I Wasn't trying to be mean really.

author
miiwii3 made it! (author)2009-02-27

htis isn't green because it's a waste of batteries. as you may know when you short a battery you shorten It's life therefore using more batteries, going through more metal and chemicals( the ones in the battery I mean). Sure you used a dead battery as the case and the wool was recycled But that doesn't save the planet! I DON'T WANT TO BE MEAN BUT THIS ISN"T GREEN

author
dalbyman made it! (author)2009-02-27

Ive been doing this for years, only ive been using it as a makeshift bomb detonator. Every time i have done this unless the battery is flat the wire just goes red hot and burns for a second or so before breaking. Are UK batteries better or something :s

author
ibuildcoolstuff made it! (author)2009-02-19

wouldn't doing this short circuit the other nine volt and cause it to heat up as well?

author
pbawesome made it! (author)pbawesome2009-02-19

yea so, double the heat. i would a designed differenty tho