Dell Inspiration 15 7000 Gaming Shuts down when the plug is out.

I only had this laptop for one day and when I unplug the charger it shuts down. Earlier in the day it didn't had this type of problem. In about 4 or 5 hours the computer shut down randomly to configure the updates and when i take out the plug it shuts down. 

I notice that the light blinks orange many times then white??.  How can I fix this ?