The email subject line was blunt, devoid of any corporate pleasantries:
The TH pins are connected to an NTC Thermistor inside the battery pack. hart 20v battery pinout diagram better
This is a safety pin. It connects to an internal NTC thermistor that monitors the temperature of the Lithium-Ion cells. If the battery gets too hot during use or charging, the tool or charger will cut power to prevent a fire or cell damage. The email subject line was blunt, devoid of
The HART 20V battery system, sold primarily through Walmart, has gained a massive following for its affordability and performance. However, for DIYers looking to repair a pack, build a custom power tool adapter, or use the batteries for robotics, understanding the is essential. If the battery gets too hot during use
If you're building adapters, repairing chargers, or troubleshooting a dead pack, knowing the pinout is essential. HART 20V batteries (interchangeable with and some Kobalt 24V —but double-check voltage) use a 4-terminal design under the main plastic slide.
Are you looking to build a or are you trying to troubleshoot a battery that isn't charging correctly?