Code cracked and panel removed, we move on to disconnect the battery and realize things are strange.

This wide-headed T5 screw serves as a super-secure press connector for the battery.

Folding the connector back reveals some copper pads. Two large ones for positive and ground from the battery, and several smaller points. Perhaps... Test Points?

A test point is an exposed metal pad that allows for electronic circuit diagnostics. Think of it as a portal to the circuit, revealing continuity, allowing for test signals, and providing additional spots to short the board.