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 mod…

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