The Hart 20V battery family (20V nominal, lithium-ion) powers consumer cordless tools. Different Hart batteries may use slightly different pin arrangements, but most follow a common pattern: power terminals, a thermistor/temperature pin, and data/communication or ID pins. Below is a clear, practical breakdown you can use to understand, test, or wire adapters for Hart 20V-style packs.
: A secondary communication pin that can trigger under-voltage protection to prevent the battery from draining to a point of permanent damage. Negative (-)
: The TH (Thermistor) pin is a 10kOhm sensor connected to B+. If the battery is too hot or too cold, the charger will refuse to start, and the tool may shut down automatically to protect the hardware.
The Hart 20V battery family (20V nominal, lithium-ion) powers consumer cordless tools. Different Hart batteries may use slightly different pin arrangements, but most follow a common pattern: power terminals, a thermistor/temperature pin, and data/communication or ID pins. Below is a clear, practical breakdown you can use to understand, test, or wire adapters for Hart 20V-style packs.
: A secondary communication pin that can trigger under-voltage protection to prevent the battery from draining to a point of permanent damage. Negative (-) hart 20v battery pinout diagram better
: The TH (Thermistor) pin is a 10kOhm sensor connected to B+. If the battery is too hot or too cold, the charger will refuse to start, and the tool may shut down automatically to protect the hardware. The Hart 20V battery family (20V nominal, lithium-ion)