RE: "No Battery is Detetced "
Thanks for writing to us.
As the issue is still same post replacing the battery with a new one. The only other part we can suspect is the motherboard connector.
If the system is under warranty, Please click my DELL-username and write me a private
conversation with the service tag and your contact details(Name, Phone#, Address and Email). If
there is no warranty, then you could contact our team to get a quote for a paid service call -