Need A charger for Nexus 5, Which one should I buy ?

Hello xda,

I need to buy a charger for my Google Nexus 5, I want a original charger since the one i'm using now doesn't charge my phone after charging 1%-2% and gets stuck for hours and hours.

I would like to buy an original charger which can charge my phone fast, if you know any, then please suggest me.

I live in India.

Thank you :)