When the No. 9 balance car is charging, there are five grid power ICONS in the battery frame of the body, each grid represents 20%. When it is full of 40%, two grids are steady on and three grids are blinking back and forth. When it is full of 60%, three grids are steady on, and two grids are blinking back and forth; When the balance car is fully charged, the five cell ICONS flash back and forth together.
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There is also an indicator light on the power adapter, which is red during charging and green when fully charged.