Solder parts from this list : PartList

Following these 2 images (* improved images) :

Bottom part

Top part

After soldering, the PCB must be thoroughly washed from the solder pasta (flux)

Some important things to know:

SI7021 module preparation.

Solder module - remove plastic - fold the contacts -

Instructions for a battery solder.

Place corpus on a flat surface ( side is not important ), then solder battery into it.

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Last but not least - Cover open contacts with a PCB varnish.

Old platform images ( just for a reference )

Bottom part

Top part