To continue my above comment, I have booted back into ubuntu (13.04)
and, as I'd hoped, the battery is present and charging.
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https://bugs.launchpad.net/bugs/1034627
Title:
HP Pavilion
Simply running the HP Support Assistant to update the BIOS worked for
me. I have an HP Pavilion dv7. The LED next to the power adapter was
blinking white, and neither ubuntu nor windows could find the battery.
I rebooted into windows 7, ran the HP Support Assistant a few times,
which installed at