Smart Rechargeable 9V Battery

This is a custom-designed rechargeable 9V battery built using a lithium-ion cell, a TP4056 charging module, and a boost converter (MT3608) to step up the voltage to a stable 9V output.

Unlike traditional 9V batteries, this design is:

🔋 Rechargeable via Micro USB port
⚡ Adjustable output voltage (up to 9V)
🧠 Smart and efficient power solution
🖨️ Fully enclosed in a custom 3D printed case

The project uses a compact Li-ion battery (taken from a vape device), combined with a charging + boost module to create a reusable and cost-effective alternative to disposable 9V batteries.

🔋 Battery Info:

The battery used in this project is a Li-ion cell extracted from a vape.
If you don’t have this battery, you can easily find it inside used or disposable vape devices.

📌 Watch the full process of finding and extracting this battery in the video below:
 

⚙️ Features:

• Input: 5V via Micro USB charging port
• Battery: 3.7V Li-ion cell
• Output: Adjustable (set to 9V)
• Integrated charging & protection module
• Portable and compact design

🧩 Parts used:

• TP4056 + MT3608 boost module

https://s.click.aliexpress.com/e/_c4qS7Wdd 

https://s.click.aliexpress.com/e/_c3baAC9d
• Li-ion battery (3.7V)
• 9V battery snap connector
• Wires

https://s.click.aliexpress.com/e/_c3BIfLEF 

https://s.click.aliexpress.com/e/_c3dJZeEP
• Custom 3D printed case

💡 Applications:

Perfect for DIY electronics, Arduino projects, sensors, and portable devices that require 9V input.

🎬 Watch Full Build Video:

📌 For the full installation and assembly process, you can watch the YouTube video below: