The latest quirk of my brand new 2013 Windows 8 laptop is that the battery is reporting as 'plugged in, not charging'. It has been stuck on a capacity of 17% for the last week.
I don't believe the readout and think is some kind of driver conflict.
The system seems to come with both a Microsoft Windows 8 battery driver and also something that has been added by HP. I think they are conflicting with one another. A small but rather tedious problem.
I've been too lazy to fix it until now. This is what I just did to make it work again:
1) Use Control Panel / Device Drivers / Battery to uninstall the Microsoft ACPI Control Method Battery Driver.
2) With the computer plugged into the mains, remove the battery.
3) Use Control Panel/ Device Drivers /Battery/ Scan for new hardware/ to rescan for the ACPI driver, which it will re-install.
4) Plug in the battery again and 'Ta-Da' the battery is charging again.
I ran a google search about this. It seems to be a common and irritating problem.