Push on alternating sides of the connector, like small sliding connectors to unplug the battery cable from the PCB.

If that doesn't work, use a pair of tweezers to firmly grip the sides of the connector and pull straight away from the socket. Hold the tweezers closer to the connector to get a better grip.

If you're having trouble, try rocking the connector side-to-side to loosen it.

You can insert the arms of a pair of sharp tweezers into the cutouts and gently push the connector out of its socket.

To reconnect the cable, insert the connector into its socket and push on the edges until it's fully seated.

Remove the battery from the laptop.