Hart 20v Battery Pinout Diagram Better ((hot)) May 2026

Mastering Your Tools: The Ultimate Guide to a Better HART 20V Battery Pinout Diagram

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.

: Hart batteries share some DNA with Ryobi (both are TTI brands), but they use different physical terminal connections. Adapters are available to use batteries with Hart tools if needed. Hart Tools Safety Warning hart 20v battery pinout diagram better

Monitor Battery State of Charge - Use a battery level indicator or a smart battery charger to monitor the battery's state of charge, and adjust your usage accordingly.
Optimize Power Tool Performance - Adjust the power tool's performance settings based on the battery's characteristics and state of charge.
Avoid Overheating - Monitor the battery's temperature, and take regular breaks to allow the battery to cool down.

Pin 1 — B+ (main positive)
Pin 2 — Data/communication (1-wire or SMBus)
Pin 3 — NTC thermistor (temperature)
Pin 4 — Pack ID / resistor to ground
Pin 5 — B− (main negative)

When testing your battery with a multimeter, expect the following readings when measuring against the Negative (-) terminal: Expected Voltage (approx.) (+) Positive 18V – 20V Main Power Output TH 0V (Grounded) Temperature Safety ID 0V (Grounded) Pack Identification C1 1st Cell Balance C2 2nd Cell Balance C3 3rd Cell Balance C4 4th Cell Balance Troubleshooting & Maintenance Mastering Your Tools: The Ultimate Guide to a

(-) Negative: Main Ground.
(+) Positive: Main Power (Nominal 18V–20V).
ID (Identification): This is the signal pin. It communicates with the tool to confirm a valid battery is inserted.
TH (Thermistor 1): Temperature sensor.
TH (Thermistor 2): Temperature sensor (often doubled for redundancy).

The HART 20V battery 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 Monitor Battery State of Charge - Use a

ID (Identification): This pin helps the tool or charger identify the battery type or capacity, ensuring the correct power profile is used.

Method: Connect a resistor between the Positive (+) terminal and the ID terminal.
Common Value: A resistor between 2.2kΩ and 5.6kΩ usually works to trick the BMS into thinking a tool is attached.
Result: This signals the BMS to close the internal MOSFETs and allow current to flow from (+) to (-).