02-07-2011 05:41 AM
Is it normal for these laptops to still draw a noticeable amount of battery power when shut off? I notice that when I turn it off for travel that a few percent is lost when I turn it back on a few hours later. I turned it off around 1:30 pm yesterday afternoon (unplugged) and when I turned it on at 7:30 am this morning it was charging, starting at 93% (7% loss). Do I have a setting not enabled to prevent it from eating battery when turned off? What devices still draw that much power when turned off?
02-07-2011 07:46 PM - edited 02-07-2011 07:48 PM
You didn't provide any information about your computer model, OS or BIOS version, but you could take a look at this:
Even if this is not relevant a BIOS upgrade could be an idea if you don't already have the latest version. Also check your BIOS settings to make sure wake on lan is disabled or only enabled when connected with a power cord.
If neither of this suggestions solve your problem it could be useful with some info about your computer.
02-08-2011 03:55 AM
Thanks. THe following are the specifics on my machine:
W510 4318 CTO
500GB 7200 RPM hard drive
Core i7 820QM
I have the latest BIOS and just disabled the wake on lan function, although it was already set at only enabled with AC. Any other thoughts on why the battery drains so fast when turned off? Could it be the USB ports being "Always On?"
02-08-2011 07:25 AM
Yes i would suggest turning off USB always on as well. Not sure if this is the main problem here, but it will use some power so worth a try. I presume by shutting off you mean a shutdown and not standby?
Your computer is pretty much the same as mine, but hard to compare since i always use standby and standby will drain the battery.
03-16-2011 05:14 PM
Disabling the "Always on USB" feature fixed the problem on both my Lenovo x201 and a Toshiba netbook.
In the latest X201 BIOS the option is under Config --> USB --> Always on USB
01-29-2018 07:50 AM
I am seeing a 30-35% drop in a week while my P51 is turned off and in a drawer. Has not always happened so I am thinking it is a software update that toggled something. After a month sitting in the drawer, my P51's battery was dead, 0%!!! I know that is not good on my battery. I turned off the always on USB thinking that was the problem but it was not.
Maybe something in the bios but 30-35% drop in a week is way too much. My W serires would only see may 5% loss in a week.
Help if you can