Asus India — manufacturing defect in laptop

Address: Z-49 Mahendra enclave, Shastri Nagar, Ghaziabad, Uttar Pradesh

I bought an asus laptop for my college studies. I am facing battery issue from starting. I contact asus customer service and they arranged a service and replace battery by new one but i think they putted the second hand repaired battery not new. I am facing the issue again the bettery related problem is :- battery percentage decreases rapidly in seconds like countdown is going