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.
: Identifies the battery to the tool or charger to ensure compatibility. C (Control)
Sends resistance data to the charger to verify valid battery authenticity. B- (Negative / Ground) hart 20v battery pinout diagram better
At its core, the Hart battery system isn't designed to be user-serviceable. Tampering with it can be dangerous due to the volatile nature of lithium-ion cells, which can lead to fire or explosion from even a small puncture [13†L14-L16][13†L18-L23]. The risks far outweigh the benefits. Furthermore, unauthorized modifications may void your warranty [14†L34-L35]. So, why should you care about the pinout?
Disclaimer: Modifying batteries can be dangerous. Always work with caution and follow safety guidelines when handling lithium-ion batteries. Share public link Here is the typical layout from left to
: Measures 20V when paired with the Negative terminal and 0V against the Positive terminal. 5. Negative Terminal (-)
Understanding the pinout opens up several possibilities for advanced users. C (Control) Sends resistance data to the charger
Note: The outer large slots are the main B+ and B- power terminals. The inner small pins are T and ID.
Testing checklist and quick procedures
: 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.