Hp — HP New Laptop Battery Draining

Address:	Bangalore
Website:	HP India

I have bought a Laptop on 24th Aug 2021 @ HP store, Sahakarnagar, Bangalore.I have found an issue Battery draining very fast and I have informed to service center where I bought, but that adviser told me my internet is very low due to that there is background patcher not updating properly, I am really wondering about that response.Still I am cross checking my Notebook (Serial No : CND1161XV3)performance like today 2.00PM battery 100% charged full after that I switch off charging(as per service adviser suggestion) and I am using as usual around 3.15PM the battery showing 50%.
I am trying to extend warranty but this serial number not able to view in HP reedem warranty portal, even dealer didn't clarify any offers while purchasing.
This is completely negligence of service, I have lost money, time and patience which I send more money unnecessarily, this is I am feeling