Time to connect the battery and test and then close your Pono or close and then test your Pono. It is your call I was confident with my battery so I closed it plugged in the charger and watched it while it charged for an hour.

When I opened my Pono a small felt pad fell out. I deduced it should rest on the end cap of the large surface mount MLCC capacitor to cushion the battery. I think if you rest the felt pad as shown in the red circle then close the Pono shell the pad will be held in place.

Line up the (triangle shaped) black end plates in the slots and press home the shell with a satisfying snap.

I have one bonus step, however.