Overview
The DIY Power Bank Module is a high-efficiency power management solution that combines a battery charger and a DC-DC boost converter. Designed for 3.7V Lithium-based batteries (18650, 21700, or Li-Polymer), this board boosts the voltage to a stable 5V for charging smartphones, tablets, and other USB devices. It’s the perfect recycled-tech project for students looking to reuse old battery cells safely.
Key Features
Dual Functionality: Charge your batteries via Micro-USB/USB-C and power your devices via USB-A simultaneously.
Smart Protection: Built-in Lithium protection IC prevents over-charging, over-discharging, and short circuits.
Status LEDs: Integrated 4-level LED indicators show the remaining battery capacity ($25\%, 50\%, 75\%, 100\%$).
Plug & Play: No complex programming required. Simply solder your battery $(B+ \text{ and } B-)$ and you are ready to go.
Auto-Wake: Automatically detects when a device is plugged in and starts the charging process.
Technical Specifications
| Feature | Specification |
| Input Port | Micro-USB / USB-C (5V 1A/2A) |
| Output Port | USB Type-A (5V 2.1A Max) |
| Battery Voltage | 3.7V – 4.2V (Nominal 3.7V) |
| Supported Batteries | 18650, Li-Po, Li-ion (Parallel connection) |
| Efficiency | ~85% – 90% |
| Charging Cut-off | 4.2V ± 1% |
| Dimensions | Approx. 70mm x 18mm |
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