Here is the typical layout from left to right (facing the terminals): 1. Positive ( ) - Terminal 1 Main positive power delivery ( actual average). Usage: Sends power to the tool. 2. Communication / Thermistor ( ) - Terminal 2 Function: Usually designated for thermal protection.
The uses a 5-pin proprietary interface designed for power delivery, temperature monitoring, and internal cell balancing. While the main power flows through the outer terminals, the inner pins are critical for safe operation and communication with the charger. HART 20V Battery Pinout Overview
When looking at the battery with the connector facing you and the latching mechanism at the top: Positive (+/B+) Center Pins: Communication (TH, ID, and balancing pins) Rightmost Pin: Negative (-/B-) hart 20v battery pinout diagram better
: If you connect a custom device directly to the B+ and B- tabs without an inline low-voltage disconnect module, your device will drain the battery past its absolute safe floor (~15V total, or roughly 3.0V per individual cell). Dropping below this point can permanently damage the 5S internal cell structure.
Ben looked at the battery on his desk. He looked at the oscilloscope. The pulse train suddenly changed. The words ACTIVE shifted to OVERRIDE . Here is the typical layout from left to
The main power output providing approximately 20V DC. It is often located on the far right. TH (Thermistor):
HART batteries have a , but they don't output low-voltage cutoff on the terminals – the tool handles that. So if you use a HART battery for a DIY project (e.g., LED lights, fan), add your own low-voltage alarm or cutoff to avoid killing the cells. While the main power flows through the outer
As internal heat builds up during heavy usage or high-amp charging, the thermistor's resistance drops.
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