During reassembly, follow these steps to reconnect the battery:

Tuck the wires behind the connector, so the side of the connector with positive (+) and negative (-) markings is facing outward.

Make sure the wires aren't pinched by the enclosure.

Align the connector over its two metal plugs so the negative (-) side is on the left of the USB‑C port and the positive (+) side is on the right.

Slide the connector onto its plugs and push down firmly until it's fully seated.