Truly Pic’N Roll HD900 User Manual page 12

Please disconnect the charger when the battery is fully charged.
After using up the battery for the first time, it is recommended
that you charge the battery for two extra hours before
unplugging the charger.
The battery status is showed by the indicator bar colors:
Blue – full Orange – middle Red – low
If the battery icon is empty, the alert message "Low battery,
recharge please!" will appear.
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