Hell, yeah, no matter how weird it sounds, it seems true.
The laptop is a HP Envy 14 Spectre ultrabook running Windows 8 Pro. It’s a great device, well-made and pleasant to use. It’s new and runs some 4-5 hours on fully-charged battery while surfing. Originally it came with Windows 7. I’ve upgraded to W8, and this has probably caused the issue – HP doesn’t officially support W8 on this device.
When I noticed the battery was not charging for the first time, I thought the device was broken. I had already decided to take it to the service centre, but I found it fully charged when came home the next evening. The issue has repeated several times after that, and I've noticed it occurs only on Sundays. It literally turns off at 12 PM on Sunday and turns on at 12 PM on Monday.
I’ve searched for a solution, but I’ve only found out that either my battery is dead (it is not for sure), or there might be an issue with Windows power management drivers. I’ve followed the suggestions to reinstall the Microsoft ACPI-Compliant Control Method Battery, but it doesn’t help.
So far I cannot find a similar issue description. I don’t know if this is unique to my machine or reproduces on other devices.
I haven’t contacted HP support yet, but I probably will do. Or maybe I’d better contact the HP notebook battery labor union and negotiate a 7-day workweek.