The diagram is well-organized, and the labeling is clear and concise. I've used it to troubleshoot issues with my batteries and tools, and it's saved me a ton of time and frustration.
Most electronics run on 5V (USB) or 12V. Connect the output of your Hart battery adapter to a . This steps down the 20V output to your desired voltage efficiently without generating excessive heat. Summary Troubleshooting for DIYers
According to user-reported diagnostics, here are the expected voltage readings (when fully charged) between the pins: ~20-21V (Nominal 18V) Negative to TH: ~0V (Typically resistance-based) Positive to TH: ~20V Negative to ID: ~0V Positive to ID: ~20V Negative to C: ~20V Positive to C: ~0V Safety and Internal Structure Hart 20v Battery Pinout Diagram
HART is a brand collaboration between Walmart and Techtronic Industries (TTI), the same parent company that makes Ryobi, Ridgid, and Milwaukee tools. However, HART batteries are to Ryobi or Milwaukee. They use a unique BMS that authenticates with the charger.
Many makers want to use Hart 20V batteries to power custom electronics, 3D-printed robots, power wheels upgrades, or portable camping lights. While highly rewarding, you must proceed with caution. The Problem with 2-Wire Adapters The diagram is well-organized, and the labeling is
: The primary variance lies in the physical plastic housing and terminal orientation. Ryobi utilizes a vertical post-style insertion system, whereas Hart utilizes a modern flat slide-on rail system.
Based on technical disassembly and forum analysis, Hart 20V batteries—both the 2Ah and 4Ah models—utilize a 5S lithium-ion configuration (5 cells in series), providing a nominal 18V and maximum 20V. Connect the output of your Hart battery adapter to a
: While fully charged at 20V, some Hart tools (like vacuums or drills) use a specific "extra fat" positive pin for high-current applications. Lower-demand tools like fans may only utilize a subset of these pins.