Transforming a 24V Bike Headlight Into a 4.2V Device!

Today, we are going to transform this 24-volt bike headlight into a 4.2-volt device!

The Problem:

I have a 24-volt bike headlight that was bought by my uncle. The problem is that the headlight he bought requires a 24-volt battery to power up. In order for me to use it, I had to transform it into a 4.2-volt device.

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Supplies

Let's start with the things that you will need. You'll need a 24-volt bike headlight, a battery charger module, three pieces of LED lights, three pieces of 6.2-ohm/1-watt resistors, and lastly, the star of the show, which is the 18650 battery.

24-volt bike headlight
battery charger module
LED Lights
6.2-ohm/1-watt resistors
18650 battery

Tools Required:

Soldering Iron
Soldering Lead
Tweezers
Desoldering Pump
Solder Paste
Wire Cutter
Wire
Solid Wire
Black spray paint

Step 1: Removing All the Unnecessary Components

Let's start by opening the bike headlight and removing all the unnecessary components inside. The only components that should be left are the switch and the protective glass.

Step 2: Paint the Body of the Bike Headlight

Next, we are going to paint it to make it look nicer using black spray paint.

Step 3: The LED

While we wait for the paint to dry, we will work with the LEDs. We will remove the old PCB from the protective glass and then place the LEDs inside the protective glass. We will secure them in place using adhesive.

After that, it's time to put the 6.2-ohm resistor in each LED, and I will use a solid wire to connect all the positive and negative polarities of the LEDs.

Step 4: Putting All the Components Inside

Now that the paint is already dry, it's time to put all the components inside.

Step 5: The Battery

Now that the paint is already dry, it's time to put all the components inside. We'll start with the LEDs, followed by the battery charger module. We will make a hole in the case of the bike headlight to provide a way for the Type-C charger to plug into the charger module. Next, we will solder the positive and negative sides of the 18650 battery to the charger module. To prevent short circuits, I covered both ends of the 18650 battery with electrical tape.

Next, it's time to put it into the case of the bike headlight. I used adhesive to hold the charger module in place.

Step 6: Closing the Case

After that, I closed it using screws.

Step 7: Charging the Battery

Now, as you can see, after I plug in the Type-C charger, the red LED turns on. Once it is fully charged, the blue LED of the charger module will turn on.