Hart 20v Battery Pinout Diagram |work|

| Pin Number | Label / Function | Description | | :--- | :--- | :--- | | | V+ (Positive) | Main Positive Voltage Output. This is the "hot" wire. | | Pin 2 | TH (Thermistor) | Temperature Sensor (usually NTC). Connects to internal thermistor. | | Pin 3 | ID / Com | Identification/Communication. Used by tools/chargers to identify battery. | | Pin 4 | NC / Aux | Often Not Connected (NC) or used for auxiliary balancing in smart packs. | | Pin 5 | V- (Negative) | Main Negative/Ground. This is the common ground. |

When looking at the battery with the terminals facing you, the five main pins generally function as follows: Label/Function Positive (+) Main 20V power output. TH (Thermistor) Monitors temperature to prevent overheating. Tool identification signal. C (Control) Control signal for communication with the charger or tool. Negative (-) Common ground/return path. Voltage Readings for Troubleshooting Hart 20v Battery Pinout Diagram

HART does not publish engineering schematics. However, these resources are helpful: | Pin Number | Label / Function |