Win 8.1 battery indicator/charging issue (works fine in Ubuntu)

going to try and keep this short and sweet an hope to get some help:

Received new laptop (lenovo y50) on monday, comes with 8.1 pre-installed. plugged in and turned on, charged up that night no problems. After getting to 100% i unplugged to discharge it, got down to around ~20% then plugged it back in and left it charging overnight, thats when the problems began.

turned it on next day and battery was still only at 21% wouldnt budge, so i left it unplugged to run it out to 0, the indicator just stayed showing 21% left until it finally died an hour or 2 later. After that it still wouldnt increase its charge just stuck at 0%. since then i did all the troubleshooting ive found online from people with similar problems with many different makes of laptops.

Since then i have run the computer on just the power cord so its good. Ive uninstalled and reinstalled the acpi compliant battery method in drivers multiple times. ive uninstalled and reinstalled the lenovo power management 4+ times. ive disconnected the battery and power cord and held the power button down for 30 secs blah blah. Ive done a fresh install of win 8.1.

Where im at today:

I can charge the battery from 0-100% with the laptop turned off in 2-3 hours.
when on and in use it can take over 24 hours to charge up.
The indicator NEVER changes its % charged amount whether on ac power or battery power unless i restart/shutdown. the indicator does show if the ac is connected and charging or running on battery by pulling the cord in and out while on.

i contacted the vendor about returning for refund which i planned to ship i out on monday. then i decided on a whim to try out linux (ubuntu) just to be 100% sure there was nothing i else i could try. Sure enough fire up linux from a bootable usb, set up the battery icon to show charge % and time remaining until full. battery was at 92% and the timer told me about 10 minutes to charge. Over the next 15 minutes i watched the meter climb until fully charged.

So this has confirmed windows is the culprit. any help out there?

 

If the laptop is new, and it's having a problem you can't solve quickly, it's not your job to. Put it back in the box and send it back to the vendor. It's their problem.

Why it's not showing a problem in Linux, who knows. Maybe the power management driver is just broken, regardless of reinstalls.

 

unfortunately its not just a simple return for me an international customer i lose out on the nearly 22% markup i paid for shipping+import taxes plus the shipping charges to send it back, the main reason im trying to troubleshoot it as much as possible. if the driver is corrupted which seems very likely how can i go about getting a new one, the windows acpi-compliant control method battery one. when i uninstall it then retart my computer it automatically installs installs it even if not connected to the internet so this has to be saved somewhere locally? any place i can get it online?

 

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