Powering LattePanda 3 Delta UPS?

I'm intrigued by the LattePanda 3 Delta for my latest single board computer project. After extensive research on powering options, I'm puzzled about where to source battery packs with a JST PH2.0 4-pin connector.

My plan involves acquiring or constructing a 4S2P li-ion or lipo UPS, inspired by u/Project-SBC's design in this video. However, I aim to preserve the functionality of the Delta's USB-C port, necessitating connection through the JST connector.

Could someone please direct me to resources detailing how to accomplish this? Your assistance would be greatly appreciated.