Same problem Toshiba SATELLITE S50D-A-10C.

Did a little check:
2 HDD's: One with Win8 and one with Ubuntu 12.04 (new install)...
- Plugged in the Win8, booted and then powered off - no batary discharge.
- Plugged in Ubuntu, booted and then powered off - a very quick batary 
discharge (40%:12hr!!!)
- Plugged in the Win8, booted and then powered off - no batary discharge.
- Plugged in Ubuntu, left off - no batary discharge.
- Booted Ubuntu and then powered off - a very quick batary discharge
under windows 8 there is a proprietary program that manages PC power. Probably 
under Ubuntu a specific power setting is being changed (something similar to 
USB charge when off or Wake on LAN or something) and we need to find it and 
disable it unless needed...

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https://bugs.launchpad.net/bugs/1098697

Title:
  High Battery discharge rate when Laptop is off.

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