20v Battery Pinout Diagram Fix - Hart

Hart batteries contain a built-in fuse, often on the BMS (Battery Management System) board. If the fuse blows, the battery will show 0V across the terminals even if the cells are good.

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

: Located on one outer edge. This provides the primary 20V DC output to the tool. Hart batteries contain a built-in fuse, often on

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. This provides the primary 20V DC output to the tool

If the charger shows a rapid red flashing light , the battery may be too hot or cold. Let it sit at room temperature for 30 minutes before trying again.

Do not connect B+ and B- directly with a wire, as this can cause fire or explosion.

The battery delivers ~20V when fully charged and drops to around ~16-17V before shutting down. Ensure your electronics can handle this voltage range.