– is Negative terminal
+ is Positive terminal
ID is for tool to identify the battery
D is Data for communication
TH is Thermistor for temperature monitoring
C1 to C9 is junction between cell groups (for balancing)
HART 40V Battery Interface & Pinout Wiring Diagram
Data Measured from HART 40V Battery
Positive and Negative = 40V
– and ID = 0V
+ and ID = 40V
– and D = ~ 2.8V
+ and D = ~ 3.6V
– and TH = 40V
+ and TH = 40V
– and C1 = 4V
– and C2 = 8V
– and C3 = 12V
– and C4 = 16V
– and C5 = 20V
– and C6 = 24V
– and C7 = 28V
– and C8 = 32V
– and C9 = 36V
– and ID = ~ 1 kΩ
+ and ID = 0 Ω
– and D = 0 Ω
+ and D = 0 Ω
– and TH = 0 Ω (Room Temp)
+ and TH = ~ 2.6 MΩ (Room Temp)
