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The emergency button will only be turned on when the battery is exhausted. Do not turn on the button when the battery is sufficient. Once the voltmeter is turned on, it means the battery is discharging, so be sure to keep it off unless you want to use the emergency function.
After checking the voltage, please turn off the voltage meter. Because the voltmeter is turned on, it means the battery is discharging, so be sure to keep it off.
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