It depends on which diode, but sometimes it can.
There are 3 possibilities: either the battery is going bad, a device is being left on in the car (lights, etc) or an alternator diode is shorted.
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Under the alternator, at the bottom.
You need 2016 batteries (3Volt)
NO
beside battery engine bay
Will a Renault Megane V Plate ignition barrel fit a Renault Megane Cabriolet R PLate?
Yes there is a coolant sensor in the Renault megane.
I have a 2005 Megane Privilege and wanted to know what size battery replacement is needed for the key fob
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The quickest fix for electronic items is rebooting which is accomplished by turning them off and on again. The Renault Megane Scenic can be rebooted by disconnecting and reconnecting the battery. A mechanic will typically do this at no charge.
Is it the location of the battery,If it is, its under the drivers seat. The drivers seat tilts to reveal the battery.