You don’t need the data lines to discharge a Hart battery carefully. You only need B+ and B-.
If you’d like, I can create a labeled diagram image or a step-by-step wiring guide for a specific Hart 20V model—tell me the exact pack model number.
⚠️ Do not attempt to charge a Hart battery by directly connecting a DC power supply to the B+ and B- pins. Bypassing the BMS and the 4-pin communication protocol is extremely dangerous. It can lead to overcharging, thermal runaway, and a violent lithium-ion battery fire or explosion. Always use the official Hart charger or a certified charging adapter. Hart 20v Battery Pinout Diagram
A specialized pin for managing communication between the battery and the device. C1, C2, C3, C4 (Balanced Charging):
: The internal pinout logic (Positive, Negative, Thermistor, ID) functions identically. This makes Ryobi-to-Hart 3D-printed adapters highly effective for cross-platform tool use. Safety Systems and Battery Management (BMS) You don’t need the data lines to discharge
Located on the opposite outer edge. This is the main ground/negative power rail, completing the electrical circuit back to the cells. 3. How the Battery Communicates with Tools vs. Chargers
: A control pin that manages communication between the battery's internal management system (BMS) and the tool/charger. ⚠️ Do not attempt to charge a Hart
The uses a 5-pin interface to communicate with tools and chargers. Understanding the pinout is essential for DIY projects, battery repairs, or testing. Hart 20V Battery Pinout Configuration
: Located on one outer edge. This provides the primary 20V DC output to the tool.