Battery Powered Hand Warmer

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Introduction: Battery Powered Hand Warmer

This is my first instructable so be kind. I wanted to make a hand warmer that was battery powered and rechargeable. I welcome any and all criticism. If you have any questions please feel free to ask.

Step 1: Parts List

Tools & Parts

  • Heat resistant tape
  • Hot glue gun
  • knife
  • Soldering iron
  • Balsa wood
  • 28 awg wire (about three feet)
  • Switch
  • AA battery holder
  • Cover cloth
  • AA batteries

Step 2: Prep Work

  1. Start by outlining the battery holder on the balsa wood with a pencil. You will want to leave about 1/2 inch extra on the length to make room for the switch.
  2. Cut the stenciled rectangle out with a knife.
  3. Take 3 ft. of wire (I used 28 gauge copper bead wire) and wrap it around the wood (be sure to keep the wires from touching as you spiral it across the balsa).
  4. Tape the ends of the wire with a heat resistant tape to the wood.

Step 3: Install and Drive On!

  • After finding a suitable place for the copper wire heating source. You will need to cut an appropriate slot for the switch.
  • After prepping the switch, glue in place with either hot glue or "CA".

Step 4: Glue and Solder

  • Solder all connections in place and prep for the cloth cover. (heat resistant tape is amazing at this stage)!!!

Step 5: Finish With Hot Glue

  • Hot glue the cloth to cover the heating coils.
  • Make sure to wrap fully around the heating coils(Don't worry, the coils should not produce enough heat to cause harm... theoretically around 100 -140 degrees Fahrenheit)
  • After the cloth is secure, hot glue the heating aspect to the battery holder.
  • It should last between 1 and 2 hrs.
  • Enjoy the warmth during the winter!!!!!!

(Disclaimer: Ensure to properly check connections and aggregate temperature).

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    24 Discussions

    0
    kode1303
    kode1303

    6 years ago

    Cool project! Have you calculated the wattage? (Volts * amperes = watts).
    Considered using kanthal wire ("heat wire")? It has unusually high resistance, sp it's good for turning current into heat :-)

    0
    shounaki
    shounaki

    Reply 6 years ago

    I didn't think about that at the time. But that's definitely an idea I will look into.

    0
    Tad Rosenberg
    Tad Rosenberg

    6 years ago

    This is great! Thanks for sharing. Shine the light that you have

    0
    bratan
    bratan

    6 years ago on Introduction

    Nice instructable. Two questions. Why balsa wood and specifically which heat resistant tape you used?

    0
    shounaki
    shounaki

    Reply 6 years ago

    I used balsa because it was extra left over and light. The tape was also left over, but I purchased it at harbor freight a while back. You could probably use duck tape and be fine, but heat resistant tape should be farely easy to spot at home depot or lowes.

    0
    fm00078.
    fm00078.

    Reply 3 years ago

    I did this decades ago... do not use Duct Tape.

    It not only does it melt, it becomes GOOEY. A real sticky mess if it's not covered well.

    .

    0
    ashaw19
    ashaw19

    5 years ago

    is it possible to charge a mobile using hand warmer

    0
    BenjaminB10
    BenjaminB10

    Reply 3 years ago

    why would you want to do that?

    0
    aespinal1986
    aespinal1986

    6 years ago on Introduction

    Great idea! I ride my motorcycle year-round and with winter around the corner this might come in handy, I'd need a flexible material were I can slip under my gloves and be able to grip the handles.

    0
    Nmoleo­
    Nmoleo­

    Reply 4 years ago

    Not to be negative, but the batteries could melt because this is essentially a short circuit. Be careful!

    0
    coggs
    coggs

    Reply 6 years ago on Introduction

    Yeah, I'd like to be able to use it while snowboarding. I'm going to buy a cheap pair of thin glove liners and stitching the wire to the outside of it. Might even be possible to run the wire around the fingers as well! I'll probably attach some velcro to the battery pack and strap it around my wrist, running insulated wire to the gloves.

    If it works I'll definitely be buying some rechargeable batteries for them!

    0
    shounaki
    shounaki

    Reply 6 years ago

    definitely, let me know how it turns out!

    0
    juanri2663
    juanri2663

    6 years ago on Introduction

    2 Questions:

    1)Do you think its possible/safe to combine this design with clothes, for example, linen gloves?

    2) Have you tried increasing the size of this project? (Higher voltage, extended wire, bigger wood, more battery power, etc)

    Great project btw. Very clear and useful. Thanks!

    0
    shounaki
    shounaki

    Reply 6 years ago

    Wow that's a great idea! It could totally work in a pair of gloves or even a shirt. It would take some work to sew it into the fabric. I did try to use a 6v battery but it burned the wire up. It was an enlightening experience.

    0
    Nmoleo­
    Nmoleo­

    Reply 4 years ago

    Not to be negative, but the batteries could melt because this is essentially a short circuit. Be careful!

    0
    Nmoleo­
    Nmoleo­

    4 years ago

    Very nice Instructable! However, the wire has so little resistance that it is basically shorting out the battery, and that could cause it to catch fire or leak acid.

    0
    LarissaP5
    LarissaP5

    4 years ago

    if I use silicone instead of the wood, work?

    0
    1 SEC2
    1 SEC2

    4 years ago

    How does it work?