DIY Battery Bank

I had some 18650 batteries laying around that I salvaged from broken devices and laptop batteries.

So I’ve decided to build my own battery bank:

Specifications:

• 250Wh (50,000mAh @ 5V)
• USB-A port
• USB-C PD port
• Lighter Plug
• Direct 16.8V XT-60 connector

Built with:

• Universal Laser Systems Laser Cutter
• HAKKO FX-888D Soldering Iron
• 18650 battery cells
• 9A 300w Step Down Buck Converter
• Small CPU fan