LxQt-powermanagement says no battery detected, on Lubuntu 19.04.
battery monitoring works on OpenSuse/Fedora.
Some relevant info on Lubuntu:

journalctl
oct. 06 12:15:52 pascal-pc dbus-daemon[970]: [system] Activating via systemd: service name='org.freedesktop.UPower' unit='u
oct. 06 12:15:52 pascal-pc systemd[1]: Starting Daemon for power management...
oct. 06 12:15:52 pascal-pc systemd-resolved[730]: Using degraded feature set (UDP) for DNS server 192.168.1.1.
oct. 06 12:15:52 pascal-pc dbus-daemon[970]: [system] Successfully activated service 'org.freedesktop.UPower'
oct. 06 12:15:52 pascal-pc systemd[1]: Started Daemon for power management.
oct. 06 12:15:52 pascal-pc ofonod[972]: ofonod[972]: enum_devices_reply: no battery detected
oct. 06 12:15:52 pascal-pc ofonod[972]: enum_devices_reply: no battery detected



lshw
  *-battery
       product: SW02032XL
       vendor: 333-42-1E-A
       physical id: 1
       slot: Primary
       capacity: 32570mWh
       configuration: voltage=7,7V



upower -d
Device: /org/freedesktop/UPower/devices/line_power_ADP1
  native-path:          ADP1
  power supply:         yes
  updated:              dim. 06 oct. 2019 15:52:02 CEST (974 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/DisplayDevice
  power supply:         no
  updated:              dim. 06 oct. 2019 15:52:02 CEST (974 seconds ago)
  has history:          no
  has statistics:       no
  unknown
    warning-level:       none
    icon-name:          'battery-missing-symbolic'

Daemon:
  daemon-version:  0.99.10
  on-battery:      no
  lid-is-closed:   no
  lid-is-present:  yes
  critical-action: HybridSleep




dmidecode
Handle 0x0017, DMI type 22, 26 bytes
Portable Battery
        Location: Primary
        Manufacturer: 333-42-1E-A
        Name: SW02032XL
        Design Capacity: 32570 mWh
        Design Voltage: 7700 mV
        SBDS Version: 1.0
        Maximum Error: Unknown
        SBDS Serial Number: 0B90
        SBDS Manufacture Date: 2018-01-04
        SBDS Chemistry: LION
        OEM-specific Information: 0x00060308




This failed: http://iam.tj/prototype/enhancements/Windows-acpi_osi.html