Introduction

We use flashlights, but there is an issue that it’s working is completely dependent on batteries, and the batteries get drained shortly. So, to resolve this issue, we will teach you about how to convert cheap flashlights to lithium.

Supplies

Let us note down the list of supplies that are essential to convert cheap flashlights to lithium. They are as follows:

Materials

• Wire snips
• 18650 batteries
• TP4056 charger module
• MT3608 step-up converter

Tools

• Hot Glue Gun
• Rotary Tool
• Soldering Iron
• Utility Knife
• Precision Screwdriver

Steps To Convert Cheap Flashlights to Lithium

Step 1: The first step is to use the screwdriver and disassemble the entire cheap flashlight.

Dissembling the Flash Light

Step 2: Remove the support rails from the outer shell.

Removing the Rails

Removing the Rails

Step 3: While grinding, we have made a small notch where you can access the hatch which you have placed inside the TP4056 charger board in the lithium cell.

Accessing the Hatch

Step 4: In this step, you have to solder the battery connection.

Soldering the Connections

Step 5: Connect the wires with the extra switch, which will cut the additional voltage.

Connecting Extra Wires

Step 6: Set the voltage meter to 4.5 V and check the voltage.

Checking the Voltage

Step 7: At the end, connect two wires from the output pads of the step board to the original wires that were previously connected with the battery terminals.

Connecting the Wires

Step 8: Now, use the hot glue gun and make sure all the components are sticked

Sticking the Components

Step 9: Secure the screws with the help of the Screwdriver.

Securing the Screws

Step 10: Solder the extra wires in the hole.

Soldering the Additional Wires

Step 11: Finally, add the cover back, and your project is finally connected.

Adding the Back Cover

Flashlight with Lithium

Things To Remember

• Make sure all the connections are soldered appropriately.

Saquib Siddiqui

Saquib Siddiqui is a Mechanical Engineer with expertise in science projects and experiments. Saquib’s work focuses on integrating scientific concepts with practical applications, making complex ideas accessible and exciting for learners of all ages. In addition to his practical work, Saquib has authored several articles, research papers, and educational materials.