HP Pavilion battery healthy and charged but laptop is not running on battery

A serious and odd problem has developed with my Pavilion (HP 15-N096EA PC)
I removed the battery when the machine was switched off and pressed the start button as this procedure was suggested on a site for clearing malware issues.
Since then, my laptop has refused to run on battery. Behaves as if there was no battery in it. The Pavilion is relatively new, the battery is in perfect condition, charges to 100% and keeps the machine running for up to 6-8 (!) hours. Not kidding.
Even now, the mains connection charges the battery, the little icon says so in the system tray. It is now 100% charged.
But when I unplug the mains adaptor the whole thing dies immediately.
I applied electric contact cleaning liquid to the connection ends of the battery, even measured the voltage in the battery with the tipped ends of a volt meter. All reading perfect values, yet the computer has stopped working from battery.
An hour ago this computer worked completely well on battery, but since the current "draining" exercise absolutely nothing. Tried all sorts of options: Taking battery in and out while on mains, nothing doing. If I am correct, battery calibration can only happen with the computer running on battery and this computer refuses to run on any battery.
What has happened here please? ANY HINT,ADVICE, SUGGESTION from professionals, non-professionals most desired and appreciated. Thanks.

Hi @Squinancy
Welcome to the HP Support Forums!
From your description it sounds like you were try to do a hard reset of your notebook to start with, but it is possible it was not done properly. Read through this, and try it again.
HP Notebook PCs - Use Hard Reset to Resolve Hardware and Software Issues
If after that the computer is still not booting up on battery, check through this one next.
Battery does not power the notebook or hold a charge
Let me know how it works for you, and if you have more trouble please post any other details you can.
Malygris1
I work on behalf of HP
Please click Accept as Solution if you feel my post solved your issue, it will help others find the solution.
Click Kudos Thumbs Up on the right to say “Thanks” for helping!

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