Windows 8.1 says "no battery detected."

jewie27

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Sep 12, 2011
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My Sony VGN-NR160E says "no battery detected" in Windows 8.1. It didn't work when I had Vista installed either. It stopped working about 6 months ago. How can I test if it's a hardware or software issue? I updated the BIOS and hard reset the battery with no luck.