Battery Pinout Diagram [work] — Hart 20v

The pinout for a Hart 20V battery typically consists of five primary terminals that manage power delivery, temperature monitoring, and tool identification. Hart 20V Battery Pinout Configuration

Simulating the Thermistor (If the battery won't turn on)

If your battery requires the thermistor circuit to activate: Hart 20v Battery Pinout Diagram

Terminal Identification (Left to Right)

| Terminal Label | Shape/Size | Primary Function | Typical Voltage | |----------------|------------------|--------------------------------------|------------------| | B- (Neg) | Large flat slot | Main negative / Ground | 0V (Reference) | | T2 | Small square pin | Temperature Sensor (Thermistor 2) | ~0.8V - 2.5V | | T1 | Small square pin | Temperature Sensor (Thermistor 1) | ~0.8V - 2.5V | | ID | Small square pin | Battery Identification / Data (1-Wire) | 0V - 5V (PWM) | | B+ (Pos) | Large flat slot | Main positive (Pack voltage) | 20V (Nominal) | The pinout for a Hart 20V battery typically

2. ID / CH (Identification or Charge Enable)

• In some Hart batteries (especially older or compact models), this pin connects to a fixed resistor (e.g., 10kΩ to B-) that tells the charger what chemistry and capacity.
• In newer models, this pin is for thermistor (NTC) – the charger reads resistance to detect temperature. A cold or hot battery will refuse to charge.
• If you bypass this pin, the charger will not start.

Are you looking to rebuild a dead battery or are you trying to bypass the protection circuit for a specific project? Hart 20v Battery Pinout Wiring Diagram In some Hart batteries (especially older or compact

Probe Positive and Negative: Check the outer-most terminals. A healthy, charged battery should read between 18V and 20.5V.