Hart 20v Battery Pinout Diagram (2026)

When testing with a multimeter against the terminal on a fully charged pack, you should see: B+ to B- : ~20V (Full capacity) TH to B- : ~0V (unless active) ID to B- : ~0V (resistance-based)

| Pin # | Pin Name | Description | | --- | --- | --- | | 1 | B+ | Positive terminal (thick red wire) | | 2 | B- | Negative terminal (thick black wire) | | 3 | T | Thermistor (temperature sensor) | | 4 | ID | Identification pin (communicates with charger) | | 5 | P | Sense pin ( monitors battery voltage) | Hart 20v Battery Pinout Diagram

These readings reveal several important points: When testing with a multimeter against the terminal

The Hart 20V battery's five-terminal pinout diagram reveals a sophisticated and intelligent power source. The combination of the main power terminals with a thermistor, identification, and control pin allows for safe and efficient operation that maximizes both performance and lifespan. While direct compatibility with other brands is non-existent without an adapter, the platform's internal logic is a testament to modern battery technology. For DIY enthusiasts, understanding this pinout opens doors for custom projects, while also providing the knowledge needed for basic troubleshooting and maintenance. However, it is crucial to always prioritize safety when working with lithium-ion batteries, respecting their power and potential hazards. By understanding the "why" behind the pins, you can get the most out of your Hart 20V tools, whether you're a weekend warrior or a dedicated craftsman.