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My Windows 8.0 behaves inconsistently with low battery warnings. Sometimes I receive it at 7% of battery, sometimes at 10%.

I thought it depends of current power plan, but settings of ALL plans are the same:

                           On battery     Plugged in
----------------------------------------------------------
Low battery level              10%           10%
Critical battery level          5%            5%
Reserve battery level           0%            7%

Do you know any reason why Windows is throwing low battery warning at 7%? Obviously, preset value is always 10%, why is warning at 10% skipped? (And from where comes that 7% warning level?)

Edit: image attached:

enter image description here

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  • Are the low battery and reserve battery level warnings even different? Whats more likely is your battery is discharging from say 11% to 7%. Are you using the OEM software to manage the charge or just windows?
    – Ramhound
    Commented May 2, 2014 at 18:24
  • Is your battery getting old? Its possible that it's getting unstable as it ages and dropping quickly from 10-7%.
    – uSlackr
    Commented May 2, 2014 at 20:39
  • @Ramhound – I have added a screenshot, levels are managed by Windows. Tab Lenovo Energy Management contains only button leading to this screen so I don't think OEM software is managing battery levels. (Or might be there a side effect? :)
    – miroxlav
    Commented May 2, 2014 at 20:43
  • @uSlackr – good question. I'm experiencing this since first days of my laptop. Current wear state of the battery (after 1.5 years) is 11% (according to Battery Bar Pro).
    – miroxlav
    Commented May 2, 2014 at 20:44

1 Answer 1

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I think I found potential reason.

10% level is always in effect and usually works.

BUT I observed that battery sometimes fails to report its charge level continuously, regardless of used monitoring software. During decrease of charge, it gets stuck at 14%, then indicating no changes for a few minutes and then suddenly showing 7%.
During this sudden change from 14% to 7%, battery alarm for 10% level goes off, but displaying current level what is 7%. So I can actually see alarm triggered by 10% level but showing 7%.

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  • perhaps there are driver or system software updates available.
    – uSlackr
    Commented May 7, 2014 at 12:33

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