When the old battery is used, the actual voltage value and the rated voltage value are quite different, so you need to measure voltage value in actual use. Instructions: When a new battery is used for the first time, the rated voltage value is close to the actual value. To judge the stop discharge voltage, a reasonable discharge voltage value can be obtained according to the universal voltage calculation method of the battery. Battery charging usually uses slow charging (fast charging can be relatively large in voltage and current, but it is easy to damage the battery.) The charging voltage of slow charging is 1.2 times the rated voltage, and the charging current is adjusted to about 2/10 of the rated capacity current of the battery. For example: the charging voltage of a 6V 50Ah battery is about 7.2 volts, and the charging current is adjusted to 10A. Reference formula: charging voltage = rated voltage X1.2 charging current = rated current X0.2, Weight: 0.06393405598 Pounds, Manufacturer: Kueohse