Battery "free" Bike Light.

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About: My full time job as an Organ Grinder keeps me pretty busy but that's just small change. My part time work, as a Mohel, keeps me up to date on my student loans from UCLSD.

Intro: Battery "free" Bike Light.

  Step up and get your own "dynamo hum"...(FZ).  All jokes aside, its a simple dynamo light mounted to a Planet Bike light bracket.  On about 6 cranks I get 20 to 25 minutes of light.
  There is a 3.6 volt NiMH rechargeable battery that comes in the light.  SO, by free I refer to your out of pocket cost on batteries.

Step 1: Material

1. dynamo light....Harbor Freight, 2 for $8.
2. quick release light strap...most have a screw to change the mounting base, this is a Planet Bike
3. super glue
4. fingernail polish remover........or acetone

Step 2: Light Base

Remove the screw and discard the top thin portion.

Step 3: Level Base

Use a knife to take any high points off of the base.

Step 4: Break Light Down

Take the 4 screws out of light.
Be cautious not to let any gears or gear shafts to fall out.

Step 5: "drill" Hole for Screw

Using a hole punch I twist and push a hole through the plastic, working from both sides.

Step 6: Prep for Glue

Using the fingernail polish remover, I clean both surfaces.

Step 7: Glue

1. I put glue on the base only.
2. Screw light cover to base.

Step 8: Put It Back Together

Once glue is dry, put your 4 screws back in and your done.

Step 9: Get Rolling and Give It a Crank!

The law (here in Arizona) says you need a forward facing light visible from 200 yards.  This covers that and I only need a rear red reflector.  So, I'm now battery free!

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    24 Discussions

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    doo da doTheZuke!

    Reply 1 year ago

    In the 60s there was a light that worked from a power source that was mounted on frame and run the light from the tire.. Do not remember the name but I had one.

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    kriemerdoo da do

    Reply 1 year ago

    I believe what you are thinking of is a generator.

    The end of he rotor rubs against the edge of the tire. Terrible tech. The faster you went the harder is was to pedal. Stick with batteries IMO.

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    delecto

    1 year ago

    I know this. Works perfect

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    Celt

    8 years ago on Introduction

    No no no, you see, its a dynamo-charged rechargeable battery, so you do not need to replace them.  Just crank the dynamo to recharge the internal batteries.  This is pretty cool, now imagine if you attached a cable from the dynamo to your wheel!  (hands free charging)!!

    2 replies
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    GanodermaCelt

    Reply 8 years ago on Introduction

    Yeah, then you just have a normal light like found on about every bike. 

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    randomray

    8 years ago on Introduction

    Good instructable . Good not to have to worry about your batteries dieing on your ride . I do recommend having a cheap red blinky light for the rear it be seen much better then a reflector . In the same vein lights or reflectors on pedals make you much easier to see also .

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    onrustXOIIO

    Reply 8 years ago on Introduction

    Are you positive?  I was told it was a capacitor.
    Of course I may be wrong, and that's cool.

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    XOIIOonrust

    Reply 8 years ago on Introduction

    Yes, I've taken apart 10 or so of that kind of light. Each of them had lithium ion button cells.

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    onrustXOIIO

    Reply 8 years ago on Introduction

    Yes, you are correct. 
    Since it was featured,  I'm not going to edit it.

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    XOIIOonrust

    Reply 8 years ago on Introduction

    It doesn't bother me if you edit it or not, I just like solving little misunderstandings and helping people understand how things work. 

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    onrustXOIIO

    Reply 8 years ago on Introduction

      I thank you because I learned more about it......I went ahead and edited it anyways because it was wrong.  I'm also new here and thought I could not edit once it had been featured.
      Stay on point, please.  I WILL do more stupid stuff in "public"!

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    rimar2000

    8 years ago on Introduction

    Anyway, with or without battery, is an excellent instructable. And if there are  batteries, but they are loaded by hand, are welcome.