I bought my laptop in June of 2009 and after a year my laptop battery went dead on me. Now, I have no choice but to use my laptop with direct source of electricity. I have no one to blame but myself because I wasn't able to take care of my laptop's battery. After fully charging my battery, there are times that I don't unplug it from the socket and that is the reason that I might have been overcharging my battery.
Looks like I already need to buy a battery and check out the prices of batteries online. I know it's kinda pricey especially if I want to buy an original Dell laptop battery. I already called the store where I bought my laptop and they have no stock and I need to order from them just to get one. Yay!
I learned my lesson now, don't overcharge my battery!