The "better" way to look at the HART 20V pinout is to view it as a communication system rather than just a power source. While the outer pins provide the muscle, the inner pins provide the intelligence.
Avoid soldering directly to the battery tabs. The heat can damage the internal Battery Management System (BMS) or the plastic casing. Use HART-compatible battery adapters (available 3D printed or online) to safely tap into the power. Conclusion hart 20v battery pinout diagram better
If you are looking for a "better" explanation than the basic diagrams found in manuals, this guide breaks down exactly what each terminal does and how to interface with them safely. The HART 20V Battery Pinout Explained The "better" way to look at the HART