🔋 DIY 20000mAh Power Bank – Build Your Own High-Capacity Backup!

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🔋 DIY 20000mAh Power Bank – Build Your Own High-Capacity Backup!



Do you often find your phone dying during travel or power outages? Why not build your own 20000mAh power bank at home? It's cost-effective, fun, and perfect for electronics lovers.



🛠️ What You’ll Need:

  • 6x 18650 Li-ion batteries (each ~3400mAh)

  • BMS (Battery Management System) 3S or 4S protection board

  • TP4056 charging module or power bank charging module with 5V output

  • A small plastic or metal enclosure

  • Wires, soldering iron, and basic tools

⚙️ How to Make It:

  1. Test all batteries using a multimeter for voltage (ideal: 3.7V–4.2V).

  2. Connect batteries in parallel or series+parallel (for voltage and capacity).

  3. Attach the BMS to manage charging/discharging safely.

  4. Connect the charging module to the output of BMS.

  5. Place everything inside the enclosure, ensuring it's insulated and safe.

  6. Add USB output ports if needed, and charge it fully before first use.

💡 Tips:

  • Use battery holders for safety and easy replacement.

  • Always double-check polarity when wiring.

  • Add an on/off switch and LED battery level indicator for extra features.

✅ Final Output:

  • Output: 5V / 2A (USB)

  • Capacity: ~20000mAh (actual usable may be ~15000mAh depending on quality)

  • Recharge time: 8–12 hours with a 2A charger

With just a few components and basic soldering skills, you can create a reliable and high-capacity DIY power bank at home. Perfect for emergencies, camping, or just everyday convenience.

Stay charged, stay prepared!



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