Windows 10: battery drains fast or it randomly shutdowns after upgrade

Hi! I just recently upgraded my girlfriend's laptop to windows 10 as it is still running on windows 8 pro and I just recently installed a new RAM and when I boot up the device, the user available memory is only about 2GB so I did troubleshoot it and led me to doing a format to the device so instead of installing the same OS, I decided to upgrade her device to windows 10. after that, her device will shutdown at about 50%. sometimes it goes about 45% but it won't go below that. I already change the battery plan, put it on battery savers, disable the Intel Management Engine Interface, disable the fast boot, but it's still the same. I already check the the battery health life using the "BatteryInfoView" Utility tool and it's at 44%. What should I do?

:)

 

C6 battery drain too fast

i already done this steps still my battery drain too fast hope for other suggestions

 

Battery drains fast

After updating my Lumia 535 to Windows 10 from 8.1 battery drains too fast. It also take more charging time than before version(8.1). After charging the phone the battery drains too fast and hardly runs for 4-5 hours.

 

Battery draining fastely after update window 10 recently

My Battery is draining fastely after recently update (Cumulative Update for Windows 10 Version 1703 for x64-based Systems (KB4034674))

Battery drain in an hour even when charging then charge fastely at 63% and then take 3 to 4 hours to charge full 100% and also stop charging in this process randomly ..............

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