LG TONE Free FP8 UVnano True Wireless In-Ear Headphones (Charcoal Black) - Manual (Page 16)

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Checking the Battery Status
If earbuds are mounted in the charging case, the earbuds’ battery status is
displayed.
Otherwise, the charging case’s battery status is displayed.
If the earbuds are mounted in the charging case while plugged in, the UVnano
process will commence for 5 minutes.
Once this process is complete, the charging case’s battery status will be
displayed.
Battery
Status
Indicator
Remaining
Battery
(charger not
connected)
Charging
State (charger
connected)
Red 20% or lower Charging
Yellow 20% - 80% -
Green 80% or higher Fully charged
NOTE: When the charging case lid is closed, charging case battery status
is displayed. If the charging case has no remaining charge, there will be
no display and it cannot function. We recommend you keep the charging
case charged at all times as the earbuds are not able to be turned on and
turned off independently.