Instructions: When a battery is used for the first time, the rated voltage value is to the actual value. To the stop discharge voltage, a reasonable discharge voltage value can be obtained according to the universal voltage calculation of the battery. 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 . Battery charging usually uses slow charging (fast charging can be relatively in voltage and current, but it is easy to damage the battery.) The charging voltage of slow charging is 1.2 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 Product name: Battery over-discharge protection module supply voltage: DC 12-36V Output voltage: equal to the supply voltage Control accuracy: 0.1V consumption: less than 1.5W Range of : various batteries/lithium batteries Net weight: 28g Product size: 57 x 42 x 19mm Scope of application Applicable to all electric two-wheeled tricycle batteries within the applicable voltage range; Discharge protection of car batteries and energy electric vehicle batteries; Over-discharge protection of various batteries; Solar, wind and other supply systems. Colour: as shown Material: plastic Package Contents: 1 x XH-M609 protection module Only the above package content, other products are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.