As an aside, I just got my hands on a Pimoroni Pico Lipo 2
Pimoroni Pico LiPo 2
Something to keep in mind for future projects / versions.
Here’s what I did a while back with the Lipo Shim I had on hand.
How I soldered on my PICO LIPO Shim - Discussion / Projects - Pimoroni Buccaneers
And it now has a Display Pack attached. Plug you battery in before you add your display pack. ;)