Dell Inspiron 3521 Battery not charging

Hello,

I have a Dell Inspirion 3521 which is still under warranty and the battery is not charging for it. It is barely a year old and i need this computer for my studies at school. It is giving me messages such as the battery is not being charged and could cause a slower connection which has happened. It also says to use a 65W AC adaptor which it is.

Please help!