03-19-2016 03:02 PM
I have the following problem with my Z710. I use it mostly plugged in and so I have enabled "Conservation Mode" in Energy Manager. As a result I get the indication "plugged in, not charging" around 60% as expected. If I understand that correctly, it means that Energy Manager has to keep the battery charged at 60%, only it doesn't.
When I unplug the laptop after a day or two on conservation mode, despite showing the battery at 60%, it only lasts around 30-45 seconds and the laptop shuts down abruptly. I just get a "battery critically low" type of message and then I only have a few seconds to plug in the power cord and let it charge.
Without conservation mode, with the battery fully charged, I can use it without a problem for 4+ hours as expected. The problem has always been there, since I bought the laptop about 6 months ago. Any opinion/advice would be greatly appreciated!
03-19-2016 03:11 PM
03-19-2016 03:21 PM
Thank you for the quick response. When fully charged it lasts over 4 hours as expected, with no problems. The diagnostics are all good, so I suppose it is some sort of software problem (?). Is it possible that a gauge reset will set everything ok? But again, I have read a lot of comments on how a gauge reset may cause problems to the motherboard and I tend to avoid it...
03-19-2016 05:55 PM
Well then don't do that. You can try what we used to do back in the day over a decade ago.
Run the battery down until it shuts off, then charge it back up again a few times. The last part to truly must be done in a mode where windows or some other OS is just sitting there without a power manager. Boot CD sitting on the blue setup screen for example or some thing else.
The other thing which you could try is unplugging and using it until its down say 50% or less and the plugging it back in and see if it starts charging it back up in conservation mode. Over time it should relearn the capacity again without damaging anything.
03-20-2016 06:28 AM - edited 03-20-2016 07:23 AM
I've tried the second thing some times and the behavior is like this; when I plug it back at 50% it charges normally until 60% as it should. The problem seems to be that energy manager is unable to maintain it at 60%. The indication just freezes at 60% and the battery just fades to zero while the laptop operates plugged in.
The same "freezing" thing happens if I enable conservation mode when over 60% (for example at 70%). The battery fades while I get a stable 70% on my screen never falling to 60%.
That's why my first guess is it's a software problem of Lenovo's Energy Manager, but I haven't heard of anyone else having the same problem...
I may try your first suggestion and see if anything happens. Thanks again.
03-21-2016 05:57 AM