Cannot charge battery on Pavillion dv9700

Just got a new battery for my dv9700 (owned for 1.5 years) after my old one got to the point where it couldn't hold a 15 minute charge.
When I insert the battery, the battery monitor says the battery is 0% available and charging for approximately 5 seconds. After that, it says the battery is "0% available (plugged in, not charging)", while the battery indicator light on the computer stays flashing. HP Battery Check says that "The Primary Battery Was Not Detected."
Battery does not appear to charge at all while in the computer, with the PC turned off.
I've recalibrated my battery, flashed the BIOS and reinstalled the ACPI control with no luck... Battery was purchased new off of amazon.com.
Any suggestions?

My laptop started this same problem after I installed a new genuine copy of Windows 7. I have tried several things to no avail. I  recently read a post that recommended starting the computer in Safe mode and allowing the battery to fully discharge, then plug it in. I do so and that corrected the message saying "consider replacing the battery". However, it now says "plugged in , not charging". I have found the battery does charge. However, when it is at 100% it only lasts 15 minutes. I suspect the several months before correcting the problem, the battery became severely damaged and will not hold a charge more than 15 minutes. 
I am considering purchasing a new battery, however, I want to make sure the charging issue is fixed first. Any thoughts?

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