Diagram - Hart 20v Battery Pinout

When you drop a Hart 20V battery onto the charger, the charger usually interfaces with four out of the five pins. The charger specifically uses the Negative, Thermistor (TH), ID, and Control pins. Interestingly, the main Positive terminal is often not the primary contact for communication; instead, the charger communicates heavily via the Control and ID pins to negotiate the charging current.

Understanding the Hart 20V Battery Pinout Diagram: A Detailed Guide

These are the most straightforward terminals. The and Negative (-) terminals are responsible for delivering the battery's main power to the tool and receiving the charging current from the charger. When measured with a multimeter, a fully charged Hart 20V battery will typically read around 20.5 volts . It's important to note that while marketed as 20V, the actual nominal voltage of the lithium-ion cells inside is lower, but the pack reaches its peak voltage when fully charged. Hart 20v Battery Pinout Diagram

However, there are third-party adapters available that allow cross-brand compatibility. These adapters physically convert the battery mount and sometimes include simple circuitry to mimic the necessary communication signals. It's crucial to research these adapters thoroughly, as they may lack the full safety communication, potentially leading to over-discharge or other issues.

Not every device uses every pin.

Provides a resistance signature that authenticates the battery to genuine Hart chargers. Main Power Ground

The Hart charger monitors this pin constantly. If the pack gets too hot during rapid charging (above ~50°C/122°F), the charger halts current to prevent thermal runaway. Similarly, Hart tools will cut power if the battery overheats during heavy use. 3. The Communication / Identification Terminal ( C or D ) Location: Inner channel, next to the negative terminal. When you drop a Hart 20V battery onto

Connect to the negative input of your circuit or LVC module.

Even though both have a 20V max rating (with a real voltage of ~21.6V), the physical connector rails, the shape of the foot, and the pin locations are completely unique to Hart. Understanding the Hart 20V Battery Pinout Diagram: A

There are 3rd party adapters available that allow you to use a DeWalt battery on a Hart tool, or vice versa.