Replacing the battery When the message "Keycard battery low" appears on the instrument panel, replace the battery in the RENAULT card:
When refitting, proceed in the reverse order, then press one of the buttons on the card four times, close to the vehicle: the message will disappear. Note: it is not advisable to touch the electronic circuit or contacts on the RENAULT card when replacing the battery.
Operating faults If the battery is too weak to ensure correct operation, you can still start and lock/unlock the vehicle.
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Renault Koleos Owners Manual > Practical advice: Battery: troubleshooting
To avoid all risk of sparks: Ensure that any consumers (courtesy lights, etc.) are switched off before disconnecting or reconnecting the battery; when charging, stop the charger before connecting or disconnecting the battery; to avoid creating a short circuit between the terminals, do not place meta ...