How to Make a Rechargeable Led Flashlight With an Old Mobile Battery

In this instructable I will show to "How to make a rechargeable led flashlight with an old mobile battery"?>>>

Step 1: Things You'll Need!!

Two 1W Led
two heat sink (for led to cool down)
 mobile battery
 mobile jack
soldering iron
small led (for charging indicator)
a resistor  (for led)
a super glue

Step 2: Gluing Things....

Glue the parts with your super glue on the battery!!

Heatsink on one side
switch and mobile jack on the other>>>

Step 3: Soldering the Parts....

Now solder both 1W leds to each of the heat sink ...
Then cut two small peices of wire and connect them with the heatsink and then again cut a peice of red wire and connect it from heatsink to negative charge of the battery...

Now take a peice of blue wire and connect it to positive side of the switch...

Now turn for your small led (charge indicator)>>>>
Connect the positive leg of led to resistor and connect it to the negative side of jack....
then connect  the negative leg of led to -ve side of switch.. Take a small red wire and connect it from -ve side of switch to +ve side of charge jack...
Take a peice of blue wire and connect it from -ve leg of led till +ve charge of battery...

Finished .....

Step 4: Charging...>>>

Now time to charge it....

Step 5: Testing....

Now time to test it

Step 6: Finished......

Finally Finished>>>>
now enjoy with your small rechargeable flashlight....



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    7 Discussions


    3 years ago

    If i want to use a diode for charging circuit , how should i connect it


    4 years ago on Introduction

    those LEDs need a heatsink. while your powering them they are
    transferring alot of heat right into the battery, and the last thing u
    want is that busrting into flames.

    Do Not glue them directly to the battery!

    3 replies

    the LEDs should be mounted to the heatsink with thermal compound. and then connect that to something that u can attach the battery to so that it isn't in direct contact with the heatsink so that the heatsink has good airflow and heat isn't transferred to the battery. also be sure that the LED power wires are not shorted to the heatsink.


    4 years ago

    What do you use to charge the battery?