LED indicator status: No-load status: red light slightly bright
Charging status: red light is on
Fully charged state: red light slightly bright
Low voltage alarm setting: 1. Hold down the setting switch for 3 seconds, enter the cutoff voltage setting.
2. Press the button, select the cut-off alarm voltage (red LED).
3. When the voltage is selected, 10 seconds without operation, the device automatically save the current value and exit. (The device can automatically identify the number of battery cells, real-time monitoring when using the total voltage)
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