Thank you for the information!
I'm unsure what could be causing the issue at this point. To begin troubleshooting, I would encourage you to try the steps in this HP document: Battery Does not Power Notebook or Hold a Charge
Although the title may not match your existing issue, the troubleshooting steps are the same. The document recommends troubleshooting the power supply, battery and system board. It will also help you calibrate the battery. I believe these steps will resolve the issue. Either way, please provide your results.
Thanks again for posting on the HP Forums. Have a great day!
Mario