How to Make a 20,000mAh Wireless Touch Power Bank | 3D Printed + Quick Charging

Power banks are everywhere—but making your own custom wireless touch power bank is a next-level DIY project. In this tutorial, I’ll show you how to build a 20,000mAh fast-charging power bank with a 3D-printed body, wireless charging module, and a touch-sensitive power switch.

This project is perfect for makers who love electronics, 3D printing, and practical gadgets. The power bank charges your phone quickly, looks premium, and is fully customizable. Whether you want a compact travel companion or a unique DIY gadget to showcase, this build will give you both power and style.

I’ll cover everything—components, wiring, 3D printing, assembly, and testing—so even beginners can follow along and build their own smart power bank at home.

3D Printed Enclosure (custom-designed case for the power bank)

Laptop Batteries (Old/New) – 20,000mAh capacity

Power Bank Module (fast charging supported)

TTP223 Touch Sensor Module

2N2222A Transistor – x1

100Ω Resistor (1/4 Watt) – x1

Connecting Wires

Here is the 3D-designed object that I have printed for this project. I designed this custom power bank enclosure myself in Fusion 360, keeping all the components, spacing, airflow, and alignment perfectly in mind.

To bring the design to life, I used my Flying Bear Ghost 6 3D Printer to print all the parts. The print quality is strong, clean, and perfectly suitable for a durable portable power bank.

For this project, I am using old flat batteries from an old power bank to reduce the overall cost and make the build more eco-friendly. You can also use laptop batteries, because in most old laptops all cells don’t get damaged at the same time. Usually, only one cell becomes weak or dead, and the laptop stops working—but the remaining cells still perform very well. These healthy cells can be reused to build DIY power banks or other projects.

Start by checking each battery individually:

1. Test the output voltage of every cell one by one.
2. If a cell gives output, you can use it.
3. If it doesn’t give output, try charging it slightly. If it revives and holds charge, it can be used.
4. Some cells may be completely dead, and those should be discarded—they are not safe for a power bank.

Once you select working batteries, combine them to achieve around 20,000mAh capacity.

Now, connect all the good cells in parallel.

Parallel connection will keep the voltage between 2.5V to 4.7V, depending on the battery charge level.

Your battery pack is now ready for assembling into the power bank.

Now we will connect the TTP223 touch sensor, 2N2222A transistor, and 100Ω resistor exactly as shown in the circuit diagram.

Here’s the wiring explanation:

1. Connect the 100Ω resistor between the I/O pin of the TTP223 sensor and the base of the 2N2222A transistor.
2. The collector of the transistor will be connected to the GND (–) of the battery and also the GND of the touch sensor module.
3. The emitter of the transistor will be connected to the other end of the push-button switch of the power bank module. This acts as the ON/OFF control signal.
4. Now connect the VCC pin of the touch sensor to the positive (+) of the battery.

This setup allows the TTP223 touch sensor to act as a touch-activated switch, replacing the physical button of the power bank.

For a clear understanding, watch the attached video, where the full wiring and working is demonstrated in detail.

Now connect the battery pack directly to the power bank module:

1. Connect the +ve (positive) of the battery to the +ve input of the power bank module.
2. Connect the –ve (negative) of the battery to the GND of the power bank module.
3. After that, connect the TTP223 touch sensor module to the power bank module as shown in the circuit diagram (from the previous step).

Once all connections are completed, test the circuit.

If everything is wired correctly, the touch sensor will act like a button and the power bank module will turn ON when you touch near the sensor.

If the circuit works properly:

1. Place the sensor module inside the enclosure.
2. Stick it using hot glue or Feviqwik so it remains firmly in place.
3. Recheck the touch operation to confirm that the sensor works even after fixing it inside.

When everything is confirmed, screw the power bank module into its front enclosure section.

Now close the front panel of the enclosure using screws or strong glue to secure everything in place. Make sure all internal components are properly fixed and there are no loose wires inside.

Once the case is closed, it’s time to test the charging performance of our DIY wireless touch power bank.

As you can see in the picture above, I connected my phone to the power bank. Earlier, my phone was at 48%, and after plugging it in, the module immediately detected Quick Charging. Within just a few minutes, the battery level increased from 48% to 51%, which shows the fast-charging capability of this setup.

And that’s it!

This is how we can successfully build our own DIY Wireless Touch Power Bank with a 20,000mAh recycled battery pack, 3D-printed enclosure, and touch sensor control. It’s affordable, eco-friendly, and fully customizable—perfect for everyday use or for showcasing your DIY electronics skills.

Building this DIY Wireless Touch Power Bank is not just about creating a useful gadget—it’s about combining smart electronics, recycling old batteries, and showcasing the power of 3D printing in a single project. With a 20,000mAh capacity, fast charging support, and a touch-activated control system, this power bank performs just like a premium branded product, but at a fraction of the cost.

By using recycled laptop or old power bank batteries, we also reduced e-waste and gave new life to perfectly working cells. The TTP223 touch sensor, 2N2222A transistor wiring, and the custom Fusion360-designed enclosure all come together to create a clean, modern, and fully functional power bank that you can proudly say you built yourself.

Whether you are a beginner or an electronics hobbyist, this project proves that with the right tools and creativity, you can build high-quality, practical devices at home. Feel free to customize the design, add extra features, or create your own version of this power bank.

Happy Making!