Original Xiaomi Mi BN3A battery for Mi Redmi Go mobile with 3 months guarantee from seller. You will get an invoice from us for proof that you have bought from us to avail dealer warranty. Others might claim they will give you a warranty, but after 30 days of patelofficial guarantee, they might not respond and you don't even have a proof about buying from them. They might even refuse that you have bought from them. But with us, we give you a proof that you have bought from us in the form of invoice. We are professional people and our sales proove it.