Disclaimer: This article is for informational purposes only. Modifying batteries or building adapters carries risk of fire, injury, or property damage. Always follow manufacturer safety guidelines.
If you own Hart power tools—the popular brand carried exclusively by Walmart and known for providing excellent value—you know the convenience of the interchangeable 20V lithium-ion battery system. But what happens when a battery stops charging, your tool loses power intermittently, or you want to build a custom adapter to run another device? Hart 20v Battery Pinout Diagram
The answer lies in understanding the .
Have a unique pinout not covered here? Open your pack carefully, trace the PCB labels (often marked B+, B-, TH, ID, C), and match them to this guide. Disclaimer: This article is for informational purposes only
| Brand | B+ Terminal | Comm Protocol | Compatibility with Hart? | |--------------|-------------|---------------|--------------------------| | | Left outer | SMBus (custom) | N/A – only Hart tools | | Ryobi One+ | Left outer | ID resistor only | No – different thermistor mapping | | DeWalt 20V | Center outer | SMBus + ID | No – different pin order | | Black+Decker | Right outer | Simple thermistor | No – voltage mismatch | If you own Hart power tools—the popular brand
One or more cells dropped below 2.5V. The BMS disables charging via the communication line.