Solaar/docs/logitech/battery-level.txt

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The battery/charging level and status is reported only if the related
reporting flag in register 0x00 is enabled by the host. The
"Battery/Charging Level" byte indicates the battery level if the
"Charging State" indicates 0x00 ("Not Charging"). If "Charging State"
indicates 0x21 to 0x23 ("Charging"), the "Battery/Charging Level" byte
indicates the level of charging.
10 ix 07 r0 r1 r2 00
r0 -> Battery/Charging Level
0x00 = Reserved/Unknown
0x01 = Critical
0x02 = Critical (legacy value, don't use)
0x03 = Low
0x04 = Low (legacy value, don't use)
0x05 = Good
0x06 = Good (legacy value, don't use)
0x07 = Full
0x08..0xFF = Reserved
r1 -> Charging state
0x00 = Not charging
0x01..0x1F = Reserved (not charging)
0x20 = Unknown charging state
0x21 = Charging
0x22 = Charging complete
0x23 = Charging error
0x24..0xFF = Reserved