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The common ground for the power circuit. Why the Pinout Matters for DIYers 1. Custom Power Projects
A better understanding of the pinout enables projects like creating your own DIY adapter to use a Hart battery with other tools, or vice versa. These are not simple physical adapters—they must include custom circuitry to manage the necessary electrical communication between systems. The "EveryThang3D" website provides 3D-printable project boxes for this purpose, but you must build your own interfacing circuitry.
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| Pin Label | Common Name | Function | Typical Voltage Readings (Measured) | Key Details | | :--- | :--- | :--- | :--- | :--- | | | Main Power | Primary Positive Terminal | 20V | Labeled on the battery. This is where the main current flows out to power the tool. | | Negative (-) | Main Ground | Primary Ground Terminal | 0V (Reference) | Labeled on the battery. Completes the main power circuit. | | C (Control) | Communication | Charger/Tool Control & Gatekeeping | Negative to C: 20V, Positive to C: 0V | This pin acts as a "smart lock" for the battery, communicating with the tool's circuitry to confirm compatibility before allowing operation. | | TH (Thermistor) | Temperature Sensor | Thermistor Signal | Negative to TH: 0V, Positive to TH: 20V | Sends real-time battery temperature data to the charger. If the battery is too hot or cold, the charger will delay charging for safety. | | ID | Identification | Battery Identification | Negative to ID: 0V, Positive to ID: 20V | Communicates the battery's unique ID, capacity, and chemistry to the charger and tool. | hart 20v battery pinout diagram better
(Your pack may swap 2 and 3 or add pins; always verify.)
A temperature monitoring pin connected to a 10kOhm thermistor. It signals the tool or charger if the battery is too hot or cold to operate or charge safely. ID (Identity):
Before diving into the details, here's a clear, functional diagram to help you visualize the Hart 20V battery interface. Keep in mind these diagrams are for . The exact physical arrangement and labeling of these pins can vary between different battery models and tool interfaces [14†L33-L35]. Always verify connections with a multimeter before undertaking any project. The common ground for the power circuit
Note: The outer large slots are the main B+ and B- power terminals. The inner small pins are T and ID.
Using the proper layout ensures you avoid short circuits, preserve battery longevity, and safely handle advanced features like balanced charging. This comprehensive breakdown explains the functional purpose, voltage metrics, and troubleshooting safety protocols for each pin. The Hart 20V Battery Pinout Layout
, not the battery itself. If you use an adapter to power DIY projects, you must add your own low-voltage cutoff to prevent permanent damage to the cells. Resetting: These are not simple physical adapters—they must include
Sitting there, wedged between the cells, wasn't a sixth battery. It was a small, black PCB no bigger than a fingernail. It hadn't been in the official diagrams. It wasn't on the Bill of Materials.
: Identifies the battery to the tool or charger to ensure compatibility. C (Control)
The "better" diagram wasn't a suggestion. It was a warning.
: Higher-demand tools like vacuums or drills may use a specific "low power" positive pin to detect when the battery is drained, preventing damage to the cells.
