Complete overnight battery drain when in sleep mode

When I close the lid of my Macbook Pro Retina, the battery of my MBP Retina goes down from full to zero overnnight.
Very frustrating because this basically makes that I either have to switch the Macbook off entirely, or that I have to connect it to the power supply.
No weird settings...
- Running 10.8.1
- Energy settings: default
- Power nap is turned off
- Happens with both wifi on / off
Does anyone experience the same issue? Is there a solution?

Battery condition is "normal". I have copy/pasted the information below (in Dutch only).
Modelinformatie:
Fabrikant:          SMP
Apparaatnaam:          bq20z451
Pack Lot Code:          0
PCB Lot Code:          0
Firmwareversie:          511
Hardwarerevisie:          3
Celrevisie:          1150
Ladingsinformatie:
Resterende lading (mAh):          8485
Volledig opgeladen:          Ja
Bezig met opladen:          Nee
Volledige laadcapaciteit (mAh):          8495
Statusinformatie:
Aantal cycli:          22
Conditie:          Normaal
Batterij geïnstalleerd:          Ja
Ampèrage (mA):          0
Voltage (mV):          12502

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