Input voltage: dc3-30v, input voltage within this range
Output voltage: difference from input voltage, maximum 0.2V
Output current: 4a, Max, peak current max 6A
Dimensions: 24mm long, 16mm wide
Note: the battery needs to be connected to the reverse connection protection board first, and the polarity cannot be wrong. When the output of the board is connected to the normal battery polarity, the input is connected to the normal polarity for charging, and the input is connected to the wrong polarity for no charging.
Wiring diagram:

Diode is usually used as battery charging to prevent reverse power polarity protection, but its DC voltage drop is more than 0.5V, even up to 1V, which brings a lot of heat and reduces the efficiency of the power supply. This board uses low RDS (on) MOSFET, in the rated current range, the voltage drop is less than 0.2V, which is beneficial to improve the power efficiency, improve the reliability and safety of battery charging. When the output of the board is connected to the normal battery polarity, the input is connected to the right polarity to charge normally, and the input is connected to the wrong polarity to not charge.