In this video, I show you how to build a custom rechargeable 9V battery using a lithium-ion cell, a charging module, and a boost converter.
Instead of throwing away old 9V batteries, you can reuse the case and turn it into a smart, rechargeable power source 🔋⚡
⚡ Features:
- Rechargeable via Micro USB
- Adjustable output voltage (set to 9V)
- Compact and portable design
- Perfect for DIY electronics and Arduino projects
⸻
🛠 In this video you will learn:
- Salvaging and soldering the battery connector
- Connecting the battery to the module
- Adjusting the output voltage
- Final testing with a multimeter
- Charging indication (Red = charging 🔴 / Blue = full 🔵)
⸻
💡 The battery used in this project is a Li-ion cell (similar to vape batteries).
👉 Watch this video to learn how to safely remove a battery from a vape:
⸻
🖨️ 3D print files are available on MakerWorld
https://makerworld.com/models/2739813?appSharePlatform=copy⸻
🔧 Parts used:
- TP4056 + MT3608 Boost Module
https://s.click.aliexpress.com/e/_c4qS7Wdd
https://s.click.aliexpress.com/e/_c3baAC9d - 3.7V Li-ion battery
- 9V battery connector
- Wires
https://s.click.aliexpress.com/e/_c3BIfLEF
https://s.click.aliexpress.com/e/_c3dJZeEP - Kapton tape (insulation)
https://s.click.aliexpress.com/e/_c3S2YSwJ
https://s.click.aliexpress.com/e/_c3p1lfKL
⸻
