🔋 DIY Mini Power Bank – Pocket-Sized Backup Made at Home
🔋 DIY Mini Power Bank – Pocket-Sized Backup Made at Home
Running out of battery while on the go? Build your own mini power bank using simple, low-cost parts. It’s a great beginner electronics project and a handy gadget for emergencies.
🧾 Components Used
| Component | Function |
|---|---|
| 18650 Li-ion Cell (1x) | Power storage (2000–3000mAh) |
| TP4056 Charging Module | Recharges the battery safely |
| Step-Up Module (MT3608) | Boosts 3.7V to USB 5V output |
| USB Output Port | Connect phone or device |
| On/Off Switch (optional) | Power control |
| Small Box / Enclosure | Holds everything inside |
⚙️ How It Works
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The TP4056 module charges the 18650 cell via Micro USB.
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The MT3608 boost converter converts 3.7V from the battery to 5V USB output.
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Plug in any USB device (mobile, fan, light) to charge or power.
📐 Simple Circuit Flow
✅ Features
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Compact size – fits in pocket or keychain
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5V USB output for charging phones, LEDs, or gadgets
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Rechargeable battery
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Power backup: 2000–4000mAh based on battery used
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Can be made under PKR 300–500
🧠 Pro Tips
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Use a protected 18650 cell for safety
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Add an LED indicator to show charging status
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You can install a switch to avoid idle battery drain
🎯 Applications
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Emergency phone charger
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Outdoor or travel use
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Great school electronics project
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Custom gifting idea
🧠 Final Thoughts
A mini power bank is a smart and simple DIY electronics project. It teaches battery charging, voltage boosting, and circuit design—plus, it’s very useful in daily life.
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