This video covers my DIY attempt at creating a high capacity battery bank for usb charging. This video will discuss how I built the device as well as some reasons why you might want to build it differently than how I did for safety reasons. I feel it is important to discuss projects that may be unsafe or even projects that have failed so that others may learn from our mistakes. Another important topic in this video is the battery management system (BMS). This video is more of an in-depth project #vlog than a how-to. At least that is how I see it. My intent is that you can learn from what I did and create something even better and safer than what I have made. I spent many hours putting this together and editing the video so let me know what you think and if you have any other ideas for this project.
Disclaimer: Be sure to follow all safety precausions. I am not responsible for any harm done in attempting to build or from the finished project.
Video also on YouTube: 
Battery Management System (BMS): https://amzn.to/2U7shtt
Power Jack: https://amzn.to/2uKhiXX
Switch: https://amzn.to/2YA4z7G
4 USB Interface: http://www.icstation.com/product_info.php?aid=261&products_id=12228
Power Adapter (3Amps): https://amzn.to/2U9B0eL
ICstation Promo Code (10% off): Lucidics
If you want to learn more about battery management systems, check out this new video created by GreatScott! : 
▶️ DTube
▶️ IPFS