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I have a Samsung notebook with a dual boot configuration with Windows 7 and Kubuntu 12.04, and I mostly use Kubuntu.

Last night I fully charged its battery to 100%. After that I shut it down.

The next morning, 7 hours later, when I woke up and tried to turn it on, it simply didn't turn on. The LED on the power button stayed off.

Then, when I tried to turn it on with the AC Adapter plugged in, all looked fine, but I noticed that the battery level was at 0% now.

So I wonder, why did the battery fully discharged all the night long even with the notebook off? It makes no sense to me, shouldn't happen. I have had this notebook working for a month, when I bought it, and it never occurred before.

Do you guys have any idea what this issue could possibly be?

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Either your battery is dead or your laptop came alive during the night. Having a laptop wake up from sleep or hibernate for no apparent reason is quite common. (Hint: Check your task scheduler for tasks marked as being able to start on battery power and/or wake from sleep.) –  Daniel R Hicks Oct 13 '12 at 12:10
    
@DanielRHicks Thanks, I think this possibility could be correct, but I didn't find anything scheduled here. I tried the same thing today and, this time, the laptop was fully charged. –  thiagowfx Oct 14 '12 at 14:52
1  
I suspect that if you look through scheduled tasks you'll find at least a half-dozen that are set, eg, to go off once an hour, and are marked to start on battery. Change all those to not start on battery. –  Daniel R Hicks Oct 15 '12 at 14:41

1 Answer 1

up vote 3 down vote accepted

Seems like your laptop was not actually truly off. Try checking to make sure:

  • That you are not in hibernate, and are truly turned off.
  • That your machine doesn't have things that can cause it to "wake up" at random during the night.(like windows updates schedule)
  • That your machine's bios settings are correct.
  • That your machine's battery is not bad.

Try fully charging, and then removing the battery before you sleep for the night. If in the morning the battery is still dead then you know there's possibly a problem with the battery.

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Good tips, I'll try some of them, thanks. –  thiagowfx Dec 22 '12 at 17:34

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