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Grumpybear2000
06-03-2010, 06:15 AM
What would drain a laptop battery over night when it is turned off, is only enough charge to turn on. Battery holds charge so is not that. Its a compaq presario 2500
Appzalien
06-03-2010, 06:56 PM
Well I don't use a Laptop but I think they shut themselves off (not OS shutdown but power) when the lid is closed. If so, your lid switch maybe broken. Like a refigerator, how can you tell if the light goes out when you close the door.
QPD
06-03-2010, 08:13 PM
it might be your brother who's watching porn after you sleep!
Detale
06-04-2010, 12:14 AM
Laptop batteries in general don't last that long after a few months. How old is it?

The other thing is something called the memory effect (http://en.wikipedia.org/wiki/Memory_effect) odds are it's something like that.

As far as draining the battery while it's "sleeping" it could be that you have something set up to back up at odd times but I don't think that would kill your battery. Maybe a windows update time but then like I said it wouldn't kill your battery from that. Try shutting it off completely tonight and when you wake see if it holds the charge then bud.
Tv Controls you
06-04-2010, 02:52 AM
What would drain a laptop battery over night when it is turned off, is only enough charge to turn on. Battery holds charge so is not that. Its a compaq presario 2500

I would check to make sure it is the battery before getting too crazy with this situation.....

Easy way to test battery:
Fully charge your battery, then during night remove the battery from laptop, and then re-insert it the next day.

Then the next day, fully charge your laptop battery, but leave the battery pack inside the laptop over night.
Appzalien
06-06-2010, 02:58 PM
The battery memory effect mentioned above is for nickle cadmium batteries only. What happens is the battery somehow learns to recharge to a lower state, and stays there, so the charger indicates its fully charged but its not. The cure is to short the battery out (preferably with a huge resistor as a regular wire could get extremely hot and even melt the plastic coating unless its a really big wire) and drain it completely then recharge again. Chances are though you have a litium ion battery and they do not suffer from the memory efffect. Nickle Cadmiums are falling out of favor and are found in less and less devices.