🔋 DIY Mini Power Bank – Pocket-Sized Backup Made at Home

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🔋 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

ComponentFunction
18650 Li-ion Cell (1x)Power storage (2000–3000mAh)
TP4056 Charging ModuleRecharges the battery safely
Step-Up Module (MT3608)Boosts 3.7V to USB 5V output
USB Output PortConnect phone or device
On/Off Switch (optional)Power control
Small Box / EnclosureHolds everything inside

⚙️ How It Works

  1. The TP4056 module charges the 18650 cell via Micro USB.

  2. The MT3608 boost converter converts 3.7V from the battery to 5V USB output.

  3. Plug in any USB device (mobile, fan, light) to charge or power.

📐 Simple Circuit Flow

scss
[Micro USB] → TP4056 → 18650 Battery → MT3608 → USB Output (5V)

✅ Features

  • Compact size – fits in pocket or keychain

  • 5V USB output for charging phones, LEDs, or gadgets

  • Rechargeable battery

  • Power backup: 2000–4000mAh based on battery used

  • Can be made under PKR 300–500

🧠 Pro Tips

  • Use a protected 18650 cell for safety

  • Add an LED indicator to show charging status

  • You can install a switch to avoid idle battery drain

🎯 Applications

  • Emergency phone charger

  • Outdoor or travel use

  • Great school electronics project

  • 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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