Please support Battery levels of the G903 (feature BATTERY_VOLTAGE)

Created by: Dessa

Information

• Solaar version (git describe --tags if cloned from Solaar repository): 1.0.2_rc1 (which still reports as 1.0.1 btw. )
• Distribution: Gentoo Linux
• Kernel version (ex. uname -srmo): Linux 5.4.27-Eiko x86_64 GNU/Linux
• Output of solaar show:

Lightspeed Receiver
  Device path  : /dev/hidraw4
  USB id       : 046d:c539
  Serial       : D5D09DA6
    Firmware   : 39.06.B0040
    Bootloader : 02.09
    Other      : AA.BE
  Has 1 paired device(s) out of a maximum of 1.
  Notifications: wireless, software present (0x000900)
  Device activity counters: (empty)

  1: Logitech G903 Wired/Wireless Gaming Mouse
     Codename     : G903
     Kind         : mouse
     Wireless PID : 4067
     Protocol     : HID++ 4.2
     Polling rate : 8 ms (125Hz)
     Serial number: 47FF66EF
          Firmware: MPM 07.00.B0009
        Bootloader: BOT 55.00.B0009
             Other: 
     The power switch is located on the base.
     Supports 29 HID++ 2.0 features:
         0: ROOT                   {0000}   
         1: FEATURE SET            {0001}   
         2: DEVICE FW VERSION      {0003}   
         3: DEVICE NAME            {0005}   
         4: BATTERY VOLTAGE        {1001}   
         5: unknown:1863           {1863}   internal, hidden
         6: unknown:18A1           {18A1}   internal, hidden
         7: unknown:1E00           {1E00}   hidden
         8: unknown:1E20           {1E20}   
         9: unknown:1EB0           {1EB0}   internal, hidden
        10: ADJUSTABLE DPI         {2201}   
        11: ANGLE SNAPPING         {2230}   
        12: SURFACE TUNING         {2240}   
        13: REPORT RATE            {8060}   
        14: ONBOARD PROFILES       {8100}   
        15: MOUSE BUTTON SPY       {8110}   
        16: unknown:1850           {1850}   internal, hidden
        17: DFUCONTROL SIGNED      {00C2}   
        18: unknown:1801           {1801}   internal, hidden
        19: DEVICE RESET           {1802}   internal, hidden
        20: unknown:1803           {1803}   internal, hidden
        21: OOBSTATE               {1805}   internal, hidden
        22: unknown:1809           {1809}   
        23: unknown:1890           {1890}   internal, hidden
        24: unknown:1811           {1811}   internal, hidden
        25: LATENCY MONITORING     {8111}   
        26: COLOR LED EFFECTS      {8070}   
        27: LED CONTROL            {1300}   
        28: unknown:1830           {1830}   internal, hidden
     Battery: 4164mV, Discharging.

Describe the bug Battery status should be shown instead on "Unknown"

Additional context refs #466 (closed)