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Completes the main circuit for both tool and charger.
In this guide, we’ll break down the connector interface better than a basic manual, explaining what each pin does and how the system communicates. The HART 20V Battery Layout
Why pin functions vary There is no single industry-wide pinout for “20V” batteries because manufacturers (Hart, Ryobi, Craftsman, etc.) implement proprietary connectors and smart-pack electronics differently. Even within a brand, different generations or models can use different pin assignments and protocols.
: Located on the far edge. Delivers the main DC voltage.
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This pin monitors the internal temperature of the battery pack. It is usually connected to a NTC (Negative Temperature Coefficient) thermistor inside. If the battery gets too hot, the tool or charger uses this pin to shut down operation to prevent fire or damage.
Based on measured voltages and technical teardowns, the five pins are identified as follows: Positive (+) : The main voltage output terminal (approx. 20V). TH (Thermistor)
(Note: If you short the ID pin directly to Positive, you may trigger a protection lockout. Using a resistor is the safer, standard method.)
Often linked to BMS (Battery Management System). 2. Detailed Hart 20V Battery Pinout Diagram Completes the main circuit for both tool and charger
The Hart 20V battery utilizes a 5-pin interface designed for power delivery, temperature monitoring, and communication with the tool or charger
Sometimes a battery’s BMS will lock itself into a protection mode, making the battery appear dead. One common DIY reset method involves briefly applying a voltage to the battery’s main terminals from a known good power source to “wake up” the BMS. This technique, while not officially supported, is documented by users who have successfully revived locked Hart batteries.
Hart batteries are NOT designed to be compatible with tools from other brands. Although the physical form factor is different (Hart uses a slide-in pack [15†L45-L46] while Ryobi has a distinctive upward stalk [15†L40-L42]), it's the electronic communication protocol that ensures your safety. The BMS electronically "locks" the battery to Hart tools and chargers [16†L42-L44].
The is highly popular for DIY enthusiasts, but if you want to build custom 3D-printed battery adapters, upgrade a Power Wheels car, or construct a makeshift power supply, understanding the exact HART 20V battery pinout diagram is crucial. Even within a brand, different generations or models
: Identifies the battery to the tool or charger to ensure compatibility. C (Control)
These readings show the progressive voltage across the series of cells, confirming the balancing system is correctly sensing each cell’s level.
: Helps the tool or charger identify the battery type or capacity.
To get power flowing from the main terminals, you need to bypass the safety check using the ID pin.