Introduction: Low Cost LED Light Using Old Mobile Battery

Picture of Low Cost LED Light Using Old Mobile Battery

This is very low cost and efficient LED light System ,using waste material .

This is better than HOME LIGHT product from eveready

because u can recharge it from your nokia mobile charger .
it contains 22 LEDs so it is very bright.

and you can use more than 24 hrs on every charging.

Step 1: Requrements

Picture of Requrements

All stuff you need

1. [box]
1. [nokia charger female connector]
(u can get it from any nokia charger converter ,that converts big to small connectors).
1.[10 ohm resister]
1.[100 ohm 1/2watt resister]

22 .[WHITE LEDs]
1. [old any phone battery 3.7 volts]
1. [nokia charger for charging]

Step 2: The Circuit

Picture of The Circuit

This is very easy circuit.

Step 3:

Picture of

take a empty box

Step 4: Measure for Hole

Picture of Measure for Hole

take box and measure for holes.
then mark for hole also mark holes.

Step 5: Insert Switch

Picture of Insert Switch

Step 6: Insert LEDs

Picture of Insert LEDs

insert LEDs as shown below

Step 7: Connect Every Thing As Shown in Circuit

Picture of Connect Every Thing As Shown in Circuit

connect every thing as shown in circuit.

Step 8: Final Product

Picture of Final Product

That is ur final project

U can use it more than 24 Hrs.
and just charge it 1 Hr every time u need.

this is my first instructable so let me know if i m wrong.
Thanks every one !!!!!!


fisherman6378 (author)2017-08-01

and is it possible to use a solar panel to the project with the LDR, what size of solar panel would i require as my village receives alot of sunlight. so it becomes easier for us to charge. thanking you sir.

fisherman6378 (author)2017-08-01

Hi is it possible to add an LDR to the project ? if yes where can i add it?

GotzovaA (author)2016-12-01

Hello fantastic idea. I am looking for solutions for my project making lamps out of beer cans and the best thing I found was to light them with old phone chargers. Your idea is cool I can make them wireless and rechargeable!

danishrahman786 (author)2016-08-31

how to add charging indicator light in this project plz tell me

conntaxman (author)2009-10-27

Did you wire all the LED'S in seires?Because I see that you only used 1 resistor.I think it was running of 12vdc.

deepv84 (author)conntaxman2009-10-28

no buddy all are in series . the resister is for only work as protector . i m  using 3.7 volt nokia batt not 12 volt

lemonie (author)2009-08-10

How are the LEDs wired together - parallel? Not familiar with calling resistors registers... L

stuuf (author)lemonie2009-08-10

The picture says series, but they must actually be parallel considering the battery voltage used. A better question is how quickly will it fry the lithium ion cell with no charge regulator circuit.

hmms (author)stuuf2009-08-11

ya man,the li-ion battery cannot be charger directly from the charger output!!!
it requires a "intelligent" charger. built around a li-ion charger IC such as the bq2000 from T.I.check this out.usually such charge regulator circuits are built-in to the mobile phone!!

stuuf (author)hmms2009-08-11

You can also use a linear voltage regulator with a current sense resistor and transistor to limit the current:

hmms (author)stuuf2009-08-13

the circuit is for 4.2v cells.will it work with the 3.7v bl-5c nokia cells?

PKM (author)stuuf2009-08-12

Or, if you have a mobile phone that still charges but doesn't work as a phone (broken screen, broken aerial or whatever) you could put the whole phone in the light and use it as a charge regulator- most recent phones will charge even if switched off, and should draw minimal current from the battery.

lemonie (author)stuuf2009-08-10

The charging is regulated, discharge is pretty heavy though. L

PKM (author)2009-08-12

This is a neat Instructable, and a clever design for a portable rechargeable light (might make a bike headlight like this...). My only criticism would be your circuit "diagram"- while I can understand it it isn't very clear to read. Providing a circuit diagram drawn with straight orthogonal (horizontal/vertical) lines and the conventional symbols for components (or a drawing if they don't have one) will make your circuit easier to understand.

deepv84 (author)2009-08-11

Thanks guys for correction. well every thing is ok now . i m using this very fine no problem with charging but remember one thing don't charge it more than 2 hours .

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