Dell Inspiron N7110 battery - plugged in, not charging

I have Inspiron N7110 that is not charging even after plugged in.

Have already tried new Original AC Adaptor, with various combinations of the new Original battery out/in, device manager reset, shutdown/restart, etc but still not charging.

With new Battery level at 30% I updated the BIOS to A13, after which the Battery LED is completely off. Before this BIOS upgrade the Battery LED was flashing amber four times, then solid white. 

It seems to me that this battery not charging problem started after an upgrade to Windows 10. But not sure

Can Dell Suggest if Degrade to Windows 7 installation or new Windows 7 installation can really solve this problem? If so, then the culprit can be Windows 10 in our case and I would be more than happy to install windows 7 again. (But do you think, that if Windows control the Battery LED even when the laptop lid is down? No). Also in this very case how to obtain Windows 7 restore as Windows 10 is installed for more than 6 months time and it don't show any option to restore to factory settings. (So please help on how to restore to Windows 7 again)

Can a degrade of BIOS from A13 to A06 can help? If it is not a problem, then I can try this

My BIOS is showing Dell Original 130W Charger and 90W Adaptors are showing as unknown

Urgently looking for a assistance