Ubuntu – My laptop battery never charges to 100% and it stays on 99

18.04asusbatterylaptoppower-management

I recently bought a brand new laptop (Asus vivobook x510uf). I'm using ubuntu 18.04.2

When I plug it to charger, It charges near 98-99 percent. It always shows less than 5 min remains to full charge, but it takes about 30 min to gets 100%. After that its state changes to discharging and after few minutes the battery logo changes to a battery with cross on it and for remaining time it says "estimating…". What's the problem?

Here is an screenshot 

$ upower --dump
Device: /org/freedesktop/UPower/devices/line_power_AC0
  native-path:          AC0
  power supply:         yes
  updated:              Wed 03 Apr 2019 05:43:43 PM +0430 (155 seconds ago)
  has history:          no
  has statistics:       no
  line-power
    warning-level:       none
    online:              yes
    icon-name:          'ac-adapter-symbolic'

Device: /org/freedesktop/UPower/devices/battery_BAT0
  native-path:          BAT0
  vendor:               ASUSTeK
  model:                ASUS Battery
  power supply:         yes
  updated:              Wed 03 Apr 2019 05:45:43 PM +0430 (35 seconds ago)
  has history:          yes
  has statistics:       yes
  battery
    present:             yes
    rechargeable:        yes
    state:               pending-charge
    warning-level:       none
    energy:              39.443 Wh
    energy-empty:        0 Wh
    energy-full:         40.679 Wh
    energy-full-design:  43.046 Wh
    energy-rate:         4.065 W
    voltage:             11.55 V
    percentage:          100%
    capacity:            91.7089%
    technology:          lithium-ion
    icon-name:          'battery-full-charging-symbolic'
  History (rate):
    1554297343  4.065   pending-charge

Device: /org/freedesktop/UPower/devices/DisplayDevice
  power supply:         yes
  updated:              Wed 03 Apr 2019 05:45:43 PM +0430 (35 seconds ago)
  has history:          no
  has statistics:       no
  battery
    present:             yes
    state:               unknown
    warning-level:       none
    energy:              39.443 Wh
    energy-full:         40.679 Wh
    energy-rate:         4.065 W
    percentage:          100%
    icon-name:          'battery-missing-symbolic'

Daemon:
  daemon-version:  0.99.7
  on-battery:      no
  lid-is-closed:   no
  lid-is-present:  yes
  critical-action: HybridSleep

Best Answer

You need to calibrate your battery and sensors. Unplug and run the laptop until the machine shuts down for "critical low battery", then leave it turned off while it charges back up. One, two, or at most three cycles like this will let Ubuntu calibrate how much power is available at what sensor readings, and should cause the display to more closely reflect what you expect.

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