18650 Lithium-Ion cells in a 5S (5 series) configuration. ⚠️ Important Safety Warnings
While Hart, Ryobi, and Ridgid are all TTI brands, Hart batteries are not mechanically compatible with Ryobi tools (the slide rails differ). However, the electrical pinout is nearly identical to Ryobi’s 20V system (B-, T, ID, B+). Hart 20v Battery Pinout Diagram
~15 Volts (The BMS will shut down to prevent cell damage). 18650 Lithium-Ion cells in a 5S (5 series) configuration
Based on measured voltages and technical teardowns, the five main pins are generally arranged as follows: Description Main Power Out Primary 20V output to power the tool. TH Thermistor and Ridgid are all TTI brands
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.