Hi,
My name is Vidur and I work for the Social Media and Community Team at Dell. It appears to be a problem with the battery. Since it’s about 2 years old, it seems that it has reached its end of its life. However you can perform the following steps to confirm the battery health.
Please check in case you have battery health meter installed.
To initiate BHM go to: C:/Program Files/Dell/Quickset/battery.exe
If it is not installed then download quickset from dell resource cd or you can download the application from www.support.dell.com
You can also refer to the following link for more information on the battery issues:
Tips to Improve Battery Life on Dell Laptop :
http://dell.to/JGx5JY
Laptop Battery FAQ :
http://dell.to/iQsukS
Hope this information might help you to resolve the problem.
Thanks,
Dell-Vidur A