The main 20V (18V nominal) power output. This delivers the current to your tool.

Make a simple bench power adapter: mount a DC jack to the battery with a housing that only connects + and − through a fused holder, add an inline 30A fuse and an LED voltage indicator. Leave temp/ID pins unconnected and use only for low-risk bench experiments. Test with low current first.

Interestingly, the charger interface itself uses only four of the five pins – it does not connect to the positive terminal directly. Instead, it uses the mystery horizontal pin (which may be the Control or another signal line) to manage charging. This design ensures that charging only occurs when the BMS confirms it is safe to do so.

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. hart 20v battery pinout diagram - TikTok Shop

Understanding the Hart 20V Battery Pinout When working on DIY projects or troubleshooting power tools, understanding the battery pinout is essential. The system typically uses a 5-pin interface to manage power delivery, safety monitoring, and balanced charging. Pinout Configuration & Functions

These intermediate contact points allow the charger to monitor individual cell voltages (e.g., ~4V, ~8V, ~12V, and ~16V increments) to ensure all cells stay balanced.

: Monitors cell operating temperature to prevent thermal runaway. It links to an internal Negative Temperature Coefficient (NTC) resistor.

: While manufactured by TTI (like Ryobi), Hart 20V batteries are generally not compatible with Ryobi or 40V Hart tools without specific third-party adapters.

The Hart 20V battery typically features a 5-pin layout designed for power delivery, safety monitoring, and balanced charging. Pinout Configuration