DIY 20,000mAh Power Bank Using 21700 Cells – Fast Charging Beast!

Build your own powerful 20,000mAh power bank using high-discharge 21700 lithium-ion cells! 🔋💪
In this video, I’ll show you how I assembled a custom USB-C power bank that supports fast charging (PD/QC) and can even charge laptops, tablets, and smartphones.

✅ Features of this DIY Power Bank:
• Capacity: 20,000mAh (real capacity tested)
• Battery Type: 21700 Li-ion cells (4400mAh each, 5C discharge)
• Fast Charging: USB-C PD (up to 45–60W depending on your board)
• Ports: USB-A, USB-C, Micro USB (depending on module)
• Built-in protection: Overcharge, over-discharge, short-circuit
• Super portable, reliable, and fun to build!

🧰 What you’ll need:
• 21700 Li-ion cells (I used 5x 4400mAh 5C)
• DIY power bank PCB (with USB-C PD support)
• Battery holders / case / wiring
• Soldering tools and basic electronics skills

⚠️ Safety Note: Always use proper battery management systems (BMS) and be cautious when working with lithium-ion batteries.

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