The Hart 20V battery uses a 5-pin interface to manage power delivery, temperature monitoring, and safe charging between the battery and the tool or charger Pinout Configuration
The pinout for a Hart 20V battery typically consists of 5 main pins plus several internal contact points for balanced charging. When looking at the battery with the connector facing you, the layout generally follows this configuration: hart 20v battery pinout diagram better
The main power output providing approximately 20V DC. It is often located on the far right. TH (Thermistor): The Hart 20V battery uses a 5-pin interface
Function: This is used primarily by the charger to identify the battery capacity and state of charge. In some DIY hobbyist applications, a specific resistor value must be bridged between this pin and the negative terminal to "handshake" with the tool and allow power to flow. Why the Pinout Matters for DIY Projects Lithium battery packs can be dangerous if shorted,
: Identifies the battery type or capacity to the tool or charger. C (Control) : Manages communication between the battery and the device. Negative (-) : Main ground/return for the power circuit. Internal Balancing Points
| Terminal Label | Function | Voltage to B- (Idle) | Critical Note | | :--- | :--- | :--- | :--- | | B+ | Positive Rail | ~20V (18.5V nominal) | Never short to B- | | B- | Ground | 0V | Common reference point | | T | Temperature Sense | ~1.5V - 2.8V (varies) | If grounded, the charger faults. | | C | Clock Signal | ~3.3V (Pulsing) | Logic level voltage | | D | Data Signal | ~3.3V (Pulsing) | Carries battery health/cycle count |
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