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.
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. http://www.mpoweruk.com/performance.htm
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.
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.