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Laptop crashes though the battery is not completely drained

Last response: in Motherboards
a b D Laptop
a b V Motherboard
August 2, 2010 7:40:59 AM


I have a dell inspiron E1505 laptop with Intel Dual core on it. It has 1 GB of RAM. Since couple of days I have noticed that my laptop crashes when the battery level reached 44%. Unless I plug in the power it wouldnt start, behaving as if the laptop battery is completly drained. I have noticed this behavior both on my XP os as well as Ubuntu. So its not OS specific. I have also tried to reinstall my BIOS but I guess it didnt help. I am not sure what the problem can be? You guys have ever faced such problems? I am a newbie so please let me know if you like some more info.


a b D Laptop
a b V Motherboard
August 2, 2010 2:58:44 PM

You do not indicate how old the battery is.
The most likely cause is a battery that is failing.

Explanation: Normally the battery voltage is sampled to indicate the level of charge remaining. The discharge curve is relatively flat, then drops off rapidly when it approaches a discharged state. See the link below. What happens is as the battery ages the knee (rapid discharge) occurs sooner.
The only good way to check this is to replace the battery. You can check it by placing the battery on charge for 8 hours, then (Hard part) discharge it into a load equal to the rated current. It shoud take 1 Hour for a "New" battery.

There are some other possibilies (less likely but possible) such as:
... Charging circuit - not fully charging the battery.
... Indicating software incorrect, needs to be recalibrated.
August 2, 2010 3:01:35 PM

just buy a new battery on ebay, they are really cheap
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a b D Laptop
a b V Motherboard
August 4, 2010 9:56:06 AM

Thanks for your replies.

The battery is 10 months old. Its a third party battery. Why I am doubting is it happened all of a sudden. A day back it would discharge completely and then suddenly the laptop started crashing when the battery reaches 44% level. The battery level info in the BIOS also showed 44%. So it was not a software glitch. I also tried to reupdate my BIOS but to no avail. Is there anything else that I can try? Googling isnt helping much.
August 7, 2010 10:25:17 AM

Looks like what RetiredChief said was right. Now my laptop crashes when the battery level reaches 50%. So I guess the battery is dying down.

Thanks for all your help!
August 18, 2010 10:09:33 AM

I have excately the same problem wirt my Dell Inspiron 6400 ... and I just boght a new battery 2 weeks ago ..

Faulty battery then ?????