I recently bought an XPS 9530 and the first thing I did was upgrade the SSD and install a copy of Windows 8.1 Pro on it. I then continued to install all of the drivers listed on the Dell website for my model of laptop. I have made sure the laptop is set to the Power saver power plan but I am still only getting a max of 4 hours when the laptop is stated for 8 - and this is running no applications.
It seems that the Dell version of Windows might have an application or driver that I have missed that helps save energy?
Thanks for your reply,
I have had issues with the display drivers switching between GPUs (I couldn't get the dedicated card to kick in for games) but I fixed it by wiping the drivers - including any files that the uninstaller missed, and then reinstalled from intel and nvidia respectively. This fixed the swapping issue but didn't have any effect on the battery life. It seems unlikely that after completely uninstalling and reinstalling the display drivers that it would be the nvidia card causing the issue, do you think?