Attach M2.5 standoffs to the mounting holes with M2.5 screws.

Secure the Feather ESP32-S2 TFT and BME688 STEMMA board to the standoffs with M2.5 screws.

Connect the BME688 to the Feather ESP32-S2 TFT with a STEMMA QT cable.

Insert a battery into the battery slot. Plug the battery into the Feather ESP32-S2 TFT's JST battery plug.

Place the battery cover over the battery, sliding the battery's wire through the cover's slot. That completes the assembly!