电池电压低于5V 时，电压量程按钮开关应打在5V档上。
When battery voltage is less than 5V, voltage range switch should be set to 5V.
电池在1c的电流下放电，当电池电压低于指定保护电压时，放电就会停止。
The battery should be discharged with 1c, the discharging should be shut off when the internal cell voltage becomes less than the specified protection voltage.
欠电保护功能：当检测到电池电压低于设定值时，提示性自动阀，运行的数据自动保存；
Owe protection function:when the battery voltage detected than setting , indicative of automatic valve, operation data automatically preserve.
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