How To Make A DIY 18650 Power Bank?

by | Mar 12, 2024 | DIY, Life Hacks

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In today’s world of technology, staying connected on the go is more important than ever. Whether you’re camping in the wilderness or travelling to remote locations, having a reliable power source for your devices is essential. One solution is to create your own DIY 18650 power bank. By repurposing old laptop batteries or purchasing new 18650 lithium-ion cells, you can build a portable power bank that can charge your smartphone, tablet, or other USB-powered devices.


Before we begin, let’s gather the necessary supplies to build your DIY 18650 power bank.


  • Soldering iron
  • Wire cutters/strippers
  • Multimeter (for testing voltage)
  • Heat shrink tubing
  • Hot glue gun (optional)


  • 18650 lithium-ion cells (at least two)
  • Battery holder or battery management system (BMS)
  • USB charging module
  • Insulated wires
  • Power switch (optional)
  • Enclosure or case for the power bank

Step-by-Step Guide For Making A DIY 18650 Power Bank

In this section, you’ll read a step-by-step guide for making a power bank.

a) Preparation

How To Make A DIY 18650 Power Bank?

Prepare the body

  • Select 18650 Cells: Choose high-quality 18650 lithium-ion cells with matching capacities and voltages. Ensure they are in good condition and have not been over-discharged.
  • Safety Precautions: Work in a well-ventilated area and follow proper safety protocols when handling lithium-ion batteries, including wearing protective gloves and goggles.

b) Wiring

How To Make A DIY 18650 Power Bank?

Adjust wiring

  • Battery Holder/BMS Connection: If using a battery holder, solder wires to the positive (+) and negative (-) terminals. If using a BMS, connect the cells according to the BMS wiring diagram.
  • Connect USB Module: Solder wires from the USB charging module to the positive (+) and negative (-) terminals of the battery holder or BMS.
  • Optional: Add Power Switch: If desired, solder a power switch between the positive (+) terminal of the battery holder/BMS and the input of the USB module.

c) Assembly

How To Make A DIY 18650 Power Bank?

Assemble parts together

  • Arrange Cells: Place the 18650 cells into the battery holder or BMS, ensuring proper polarity alignment.
  • Secure Components: Use hot glue or adhesive to secure the cells, battery holder/BMS, and USB module inside the enclosure or case.
  • Wire Management: Organize and secure the wires inside the enclosure to prevent tangling or accidental damage.
  • Close Enclosure: Seal the enclosure or case, making sure all components are properly aligned and secured.

d) Testing


Test your power bank

  • Voltage Check: Use a multimeter to measure the voltage across the positive (+) and negative (-) terminals of the power bank. Ensure it matches the expected voltage of the connected cells.
  • Charging Test: Connect the power bank to a USB charger and verify that the charging module is functioning correctly.
  • Discharge Test: Connect a device to the USB output of the power bank and confirm that it charges properly.


As you work on building your DIY 18650 power bank, consider the following recommendations:

  • Quality Cells: Invest in high-quality 18650 lithium-ion cells from reputable manufacturers to ensure safety and reliability.
  • Balancing: If using multiple cells, consider using a BMS with balancing capabilities to prevent overcharging or discharging of individual cells.
  • Proper Insulation: Use heat shrink tubing or electrical tape to insulate exposed wires and connections to prevent short circuits.
  • Regular Maintenance: Periodically check the condition of your power bank and cells, and replace any damaged or degraded components.

Things to Remember

Keep these key points in mind as you embark on your DIY 18650 power bank project:

  • Safety First: Handle lithium-ion batteries with care.
  • Capacity Consideration: Calculate the capacity of your power bank based on the capacity of the 18650 cells used to ensure sufficient charging capability for your devices.
  • Customization Options: Get creative with the design and customization of your power bank enclosure, adding personal touches or decorative elements to make it unique.

With these guidelines in hand, you can make a DIY 18650 power bank. Enjoy the process and the satisfaction of knowing you’ve built a portable power solution tailored to your needs!

Also Read: How To Make A DIY Coffee Table

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