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: https://www.youtube.com/watch?v=IeT6NTGdaz0 ⚙️ 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 💡 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: https://www.youtube.com/watch?v=B8Duvxi1SOs