As I wrote about driver update V2.04 for the Acer W510 I noticed a few user reports of poor connected standby battery life. The following day I heard about V2.08. I updatedÂ againÂ but I was seeing some serious Connected Standby issues. Battery life was way below what it should have been.
Here’s some information about how you can access a very cool battery life report on Windows 8, check your CS figures and potentially fix your problem. I hope you take the time to contribute your report or thoughts in the comments below too.
Powercfg battery life report on Windows 8
Hereâ€™s how to get a battery life report on any Windows 8 device.
Hit the windows button to get to the start screen / modern UI and type cmd <return>
At the prompt type:
You’ll get a response within 5 seconds that a file has been created. Open that file with a browser and enjoy the stats. At the bottom you’ll find the average figure for your Windows 8 PC.
Example Powercfg battery report
Hereâ€™s my full report from the W510.Â Look at this snapshot below. The annotated green section shows in-spec CS drain figures. The red area shows out-of-spec CS figures. These results started after I installed V2.04 on the 2nd Feb.Â I installed V2.08 on 14th Feb.
Look at the useful summary in the last section of the report. Iâ€™ve highlighted good and bad CS figures.
On the left you can see real-world in-use figures too. Yup, I’m regularly seeing over 10hrs n the W510 with the dual-battery.
For comparison, my Z830 returns 3hrs 51 average now which would be 4:28 with a new battery.
My â€˜Fixâ€™ and Other Notes
After some testing itâ€™s appears that itâ€™s WiFi thatâ€™s drainging the battery although the cause of the problem could be elsewhere â€“ a process preventing the WiFi from going into sleep, for example. I donâ€™t think itâ€™s drivers because after what could have been a simple reboot yesterday, the device used just 2% off battery in an 11hr CS period last night. Iâ€™ll have to wait 24-48hrs to see if the problem is â€˜fixed.â€™
The interesting thing is that all the Clovertrail tablets I have used have almost the same hardware build and are likely to be using the same drivers. Thereâ€™s a chance that problem goes beyond just the Acer W510. Itâ€™s time to get some crowdsourced information from you so we can get to the bottom of this.
Post your Powercfg Reports
Please run the powercfg command above and post a link to a snapshot of your results in the last section of the report. Alternatively, just post the last line of the report â€“ the summary â€“ and include the device name and measurement period.
Are your battery reports for CS within spec?
- Under 5% per 16 hours with no background tasks
- My W510 was reporting 4-6% / 16hÂ with background tasks
- Up to 10% / 16h would seem to be acceptable
- Constant radio streaming could take this up to around 15% / 16 h
- Over 15% drain per 16 hours could be regarded as suspicious but Iâ€™ll update this as we see results from users below.
Obviously larger battery means slower % loss. I have a total of about 54Wh on the W510. The Samsung Ativ 500 has a smaller battery, 31Wh AFAIK.
If you think youâ€™ve got a connected standby problemâ€¦
If you think youâ€™ve got a problem hereâ€™s a few things you can try.
- run powercfg /energy as administrator. Youâ€™ll get a report with issues highlighted.
- Make sure your PC is not waiting for a Windows update reboot. This could be preventing some standby features. â€œUpdate and Restartâ€ via the settings charm â€“> power button.
Of course, check the comments below for more tips. Iâ€™ll update this post if anything significant comes up in the discussion.
Connected Standby is an amazing feature but when it doesnâ€™t work as expected it could catch you by surprise. I do expect laptop batteries to drain a lot if I leave the device running overnight but I donâ€™t expect to wake up to a dead Acer W510. Keep an eye on your battery performance by regularly running the powercfg battery report.