Use the pair of blunt tweezers to grip the edges of the right battery cable connector.

Pull the connector away from the right daughterboard to disconnect it.

Always pull cables by their connectors and not the wires themselves.

This may take some force. If you need to, use the tweezers to "walk" the connector out, alternating pulling from side to side.

During reassembly, note that the battery connector that goes into the right board has three battery wires, and the left has two.