The main power output providing approximately 20V DC. It is often located on the far right. TH (Thermistor):
A temperature monitoring pin that connects to an internal NTC thermistor. This pin allows the charger and tool to detect if the battery is overheating or too cold to operate.
[ (+) ] [ TH ] [ ID ] [ C ] [ (-) ] Positive Thermistor Tool Control Negative 1. Positive Terminal (+)
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The uses a 5-pin proprietary interface designed for power delivery, temperature monitoring, and internal cell balancing. While the main power flows through the outer terminals, the inner pins are critical for safe operation and communication with the charger. HART 20V Battery Pinout Overview
If you are building a custom solar charger or powering a 12V DC device, you need to know which pins to use for power ( B+ / B- ) and which to ignore. Safety Guidelines for HART 20V Batteries
If you are a DIY enthusiast or a professional on a jobsite, you know that HART tools offer an incredible "bang for your buck." Distributed by Walmart, these 20V Max lithium-ion batteries power everything from drills and leaf blowers to circular saws and flashlights. The main power output providing approximately 20V DC
The far-right terminal (usually marked with a '+' or thick trace). This supplies the positive voltage to the tool or charger.
The far-left terminal (usually marked with a '-' or thick trace). This provides the ground return path.
The main power output terminal, typically providing ~20V relative to the negative terminal when fully charged. This pin allows the charger and tool to
When looking directly at the interface of a HART 20V battery with the plastic locking latch pointing upward, you will find five primary terminal blade receptors. Pin Position Typical Label Voltage / Signal B+ Main Positive Terminal Nominal 18V / Max 20V DC Middle-Left C1 / ID Balance/Identification Internal Cell-Bank Voltage Telemetry Center TH / T Thermistor Signal Temperature-Dependent Resistance (NTC) Middle-Right C2 / Data Battery Communication Serial Data / Logic Monitoring Far Right B- Main Negative Terminal System Ground (0V Reference) 2. Deep Dive Into Pin Mechanics Power Rails: B+ and B-
: Used for temperature monitoring. The charger and tool use this to prevent overheating during use or rapid charging.
: Located on the far edge. Delivers the main DC voltage.