Use the point of a spudger to pry up and disconnect the battery connector from its socket, located above the top right corner of the battery pack.

Bend the connector away from the socket to prevent accidental contact.

To re-attach press connectors like this one, carefully align and press down on one side until it clicks into place, then repeat on the other side. Do not press down on the middle. If the connector is misaligned, the pins can bend, causing permanent damage.