I've been monitoring upower and I think the problem is it is incorrectly detecting the number of batteries in my laptop. I only have one yet upower detects 5 power sources. One of them is a DisplayDevice which normally shows the same amount of battery as my system battery. Sometimes that drops to 1% or 0%. I've had my laptop plugged in all day  here are two upower -d dumps from within the last 5 minutes. Notice in the first dump /org/freedesktop/UPower/devices/DisplayDevice has 0% battery despite the laptop being plugged in. On the second it has the same engery, energy-full, and percentage as /org/freedesktop/UPower/devices/battery_BAT0.

$ upower -d
Device: /org/freedesktop/UPower/devices/line_power_AC
  native-path:          AC
  power supply:         yes
  updated:              Mon 30 Nov 2020 02:36:20 PM PST (13554 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:               Celxpert
  model:                5B10V98091
  serial:               1695
  power supply:         yes
  updated:              Mon 30 Nov 2020 06:20:22 PM PST (112 seconds ago)
  has history:          yes
  has statistics:       yes
  battery
    present:             yes
    rechargeable:        yes
    state:               charging
    warning-level:       none
    energy:              0 Wh
    energy-empty:        0 Wh
    energy-full:         654.79 Wh
    energy-full-design:  80.4 Wh
    energy-rate:         0 W
    voltage:             7.189 V
    percentage:          0%
    capacity:            88.4453%
    technology:          lithium-polymer
    icon-name:          'battery-caution-charging-symbolic'
  History (charge):
    1606789222	0.000	charging

Device: /org/freedesktop/UPower/devices/line_power_ucsi_source_psy_USBC000o001
  native-path:          ucsi-source-psy-USBC000:001
  power supply:         yes
  updated:              Fri 27 Nov 2020 02:59:19 PM PST (271375 seconds ago)
  has history:          no
  has statistics:       no
  line-power
    warning-level:       none
    online:              no
    icon-name:          'ac-adapter-symbolic'

Device: /org/freedesktop/UPower/devices/line_power_ucsi_source_psy_USBC000o002
  native-path:          ucsi-source-psy-USBC000:002
  power supply:         yes
  updated:              Fri 27 Nov 2020 02:59:18 PM PST (271376 seconds ago)
  has history:          no
  has statistics:       no
  line-power
    warning-level:       none
    online:              no
    icon-name:          'ac-adapter-symbolic'

Device: /org/freedesktop/UPower/devices/DisplayDevice
  power supply:         yes
  updated:              Mon 30 Nov 2020 06:20:22 PM PST (112 seconds ago)
  has history:          no
  has statistics:       no
  battery
    present:             yes
    state:               charging
    warning-level:       none
    energy:              0 Wh
    energy-full:         654.79 Wh
    energy-rate:         0 W
    percentage:          0%
    icon-name:          'battery-caution-charging-symbolic'

Daemon:
  daemon-version:  0.99.11
  on-battery:      no
  lid-is-closed:   no
  lid-is-present:  yes
  critical-action: HybridSleep




$ upower -d
Device: /org/freedesktop/UPower/devices/line_power_AC
  native-path:          AC
  power supply:         yes
  updated:              Mon 30 Nov 2020 02:36:20 PM PST (13733 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:               Celxpert
  model:                5B10V98091
  serial:               1695
  power supply:         yes
  updated:              Mon 30 Nov 2020 06:24:22 PM PST (51 seconds ago)
  has history:          yes
  has statistics:       yes
  battery
    present:             yes
    rechargeable:        yes
    state:               fully-charged
    warning-level:       none
    energy:              71.71 Wh
    energy-empty:        0 Wh
    energy-full:         654.79 Wh
    energy-full-design:  80.4 Wh
    energy-rate:         0 W
    voltage:             17.173 V
    percentage:          99%
    capacity:            88.4453%
    technology:          lithium-polymer
    icon-name:          'battery-full-charged-symbolic'

Device: /org/freedesktop/UPower/devices/line_power_ucsi_source_psy_USBC000o001
  native-path:          ucsi-source-psy-USBC000:001
  power supply:         yes
  updated:              Fri 27 Nov 2020 02:59:19 PM PST (271554 seconds ago)
  has history:          no
  has statistics:       no
  line-power
    warning-level:       none
    online:              no
    icon-name:          'ac-adapter-symbolic'

Device: /org/freedesktop/UPower/devices/line_power_ucsi_source_psy_USBC000o002
  native-path:          ucsi-source-psy-USBC000:002
  power supply:         yes
  updated:              Fri 27 Nov 2020 02:59:18 PM PST (271555 seconds ago)
  has history:          no
  has statistics:       no
  line-power
    warning-level:       none
    online:              no
    icon-name:          'ac-adapter-symbolic'

Device: /org/freedesktop/UPower/devices/DisplayDevice
  power supply:         yes
  updated:              Mon 30 Nov 2020 06:22:22 PM PST (171 seconds ago)
  has history:          no
  has statistics:       no
  battery
    present:             yes
    state:               fully-charged
    warning-level:       none
    energy:              71.71 Wh
    energy-full:         654.79 Wh
    energy-rate:         0 W
    percentage:          99%
    icon-name:          'battery-full-charged-symbolic'

Daemon:
  daemon-version:  0.99.11
  on-battery:      no
  lid-is-closed:   no
  lid-is-present:  yes
  critical-action: HybridSleep