Hi Cmilj,

Thanks for posting.  Apologies that your system is not working as expected.

Sleeping is basically imprinting the system state onto the ram. For the ram to retain the information, it has to be active and consume battery.  You can try hibernating instead of sleep or hybrid sleep since it consumes the least amount of power.

http://windows.microsoft.com/en-ca/windows7/sleep-and-hibernation-frequently-asked-questions

Neither are really recommended for overnight due to the battery and other issues.  Since today's computers boot so quickly, it's not like before, it's better just to shut it off.

Hi Robert,

Thanks for the answer...

I was kind of expecting more because of previous experiences where sleep would consume about 3-5% during night. I am aware that RAM needs to be powered but 20% in 12h is a lot! Was and still are suspicious that some other component is using power as WiFI chip or CPU...

I agree about power off...hibernation is not an option since i have 32GB of RAM and that would just take tool long to store to HDD and back + would waste same amount of HDD drive space which is precious. 

Regards

Dear Robert,

I think you didnt answer the question. I am having the same issue as well. Since the last update, I think in early Jan, my laptop is draining a lot of battery in sleep state. This does not use to happen before, can you please let me know what is going wrong there? Battery goes from 100% to 20% in like 18 hours when the lid is down.

Thanks.

I have the exact same problem as you mentioned. I've installed all the latest updates, that didn't help. Makes me think its got something to do with Windows 10 rather than the BIOS, as the problem doesn't appear in linux (Ubuntu 16.04).

Your reply doesn't solve @Cmilj's problem in any way, @robert p. 

It might be a problem with Bluetooth devices waking up your notebook - of course if you have such peripherals connected/paired (your laptop might be running even with a lid closed). Such issue was described here (for 9370 though): https://www.dell.com/community/XPS/XPS-9370-missing-quot-power-management-tab-quot-to-disable-wake/m-p/5829008

I have also had this issue since I got my XPS 15 9650 with 32GB RAM last October. With previous laptops I would have had some battery drain during sleep, but nothing as bad as with this Dell. If I close the lid on the laptop at night, it will be guaranteed to be dead if I go to use it the next evening. Previous laptops I had would always have eventually hibernated.

There also seems to be a problem with hibernation on this Dell. Most of the time if I try to hibernate manually to test it does not work, and find that it has only switched off the screen.

Hello,

I am facing the same problem. Usually I put my laptop on sleep mode and put it in my backpack - when I remove it the next day there is substantial battery loss and heat generation. My full laptop pouch is hot. This did not happen with my old HP laptop. It worked flawless.

I request you please try to address this issue at the user level. Because at this instant I am wanting to go back to HP.

Thanks.

-SM

Same here and it also Turn on the XPS randomly which I don't know, it so danger !!! Last time I put it in Sleep mode, then put into my computer bag,  when I was in aircraft. lucky I take it out before take off. my XPS hot as **bleep**.