No voltage drop and heat on current sensor components
Offset and Sensitivity are calibrated in factory
Continuous current rating: 0~150A DC
Sensitivity: 20mV/A, INAV/BF scale = 200, ArduPilot BATT_AMP_PERVLT = 50
VBAT voltage sense: 0~69V, INAV scale = 2100, BF scale = 210, ArduPilot BATT_VOLT_MULT = 21.0
Power Consumption: 17mA
Voltage offset error at zero current : +-10mV
Curr output voltage error: 5%
Operating Temperatures: -30~80 °C
23 * 20* 23mm, 7g

Soldering pads
Vbat: for voltage sense, support 0~69V IN
Volt: = 1/21 Vbat, 0~3.3V out
Curr: Current signal, 0~3.3V out
5V: power supply for HCS-150A board, support 4~13V IN, 17mA
G: GND
TX/RX: for firmware update and configure (to be supported)

Tips
mount Hall sensor far from iron and magnetic material