Assemble power bank back in reverse order. Install controller plate and battery back in frame.

For the battery installation, try to place it in a position where the terminal strips are not stressed. It may prevent damage requiring disassembly should an accidental drop occur.

Insert the assembled internal frame into the outer case. Screw it back down with the two #0 screws. Set the cover back into place.

The back cover has only one possible orientation. There are two protrusions at the back side while the outer case bottom has two holes to receive them. See the photo.