This pin helps the smart charger and high-draw tools identify the specific battery capacity (e.g., 2.0Ah vs. 4.0Ah). It ensures the charger applies the correct current rate and prevents smaller packs from being charged too aggressively. Safety and DIY Warning
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. hart 20v battery pinout diagram better