I have purchased this product on the 16th of August and performance was initially very good or I must say its brilliant. But after just 15 days of use, its performance has been already deteriorated. It is only charging about 10% in 1 hour. Also, the product has 1 year of the warranty period, however, I am confused now like how should I claim the warranty. I would request the Amazon/seller to help here and let me know the further action required from my side to resolve the issue.