How do you release the automatic handbrake on a Renault laguna when the battery is flat?

To release the automatic handbrake on a Renault Laguna when the battery is flat, you can manually override the system. Locate the manual release lever, which is typically found near the handbrake mechanism under the center console. Pull the lever or press the button as per your vehicle's manual instructions to disengage the handbrake. If you're unsure, consult the owner's manual for specific details related to your model.