Critical discharge UPower level of Aspire Acer One AOA150

Trying to get a reliable estimation when it is time to switch from battery to power supply (or shut down the netbook).

Using GNOME battery status applet and upower tool (they are coherent). At present when percentage is about 50% the netbook abruptly turns off with no warning or a chance to shutdown proper.

Possible explanations:

  • 50% is the critical discharge level
  • UPower’s algorithm of calculating discharge level doesn’t fit the hardware I have.

In the latter I’d appreciate any hint how to fix it.

Experimentally I found that it takes five hours for the netbook to turn off.

Netbook: Aspire Acer One AOA-150  Battery model: UM08A71 System: Debian GNU/Linux 9.6 (stretch) UPower client version 0.99.4 GNOME Shell 3.22.3 

Additionally

$   upower -i $  (upower -e | grep BAT)   native-path:          BAT1   vendor:               SIMPLO   model:                UM08A71   serial:               1000   power supply:         yes   updated:              Fri 08 Mar 2019 04:20:30 PM EET (65 seconds ago)   has history:          yes   has statistics:       yes   battery     present:             yes     rechargeable:        yes     state:               fully-charged     warning-level:       none     energy:              144.023 Wh     energy-empty:        0 Wh     energy-full:         144.023 Wh     energy-full-design:  96.1038 Wh     energy-rate:         3.7407 W     voltage:             12.523 V     percentage:          100%     capacity:            100%     technology:          lithium-ion     icon-name:          'battery-full-charged-symbolic'   History (rate):     1552054830  3.741   fully-charged 

where

$   upower -e | grep BAT 

returns /org/freedesktop/UPower/devices/battery_BAT1. I found no clue what is this.

Why does MacBook Pro battery discharge when not in use?

I generally keep my 2018 MacBook Pro plugged in and I use it casually when not plugged in throughout the day.

With light email checking in Safari throughout the day, I have gone from 35% to 13% today. This includes large jumps that decrease while the computer is closed.

Because I am aware of this problem, I tried closing the lid when not in use, also Power Nap While Using Battery is disabled.

My previous computer was a 2015 MacBook Air. I used that in a similar way and was able to use it entirely untethered from power for the entire week.

How can I diagnose battery usage for the times that the computer is closed?