When looking at the battery connector with the pins facing you, the common functions from left to right (or as labeled on the casing) are:
Some users have noted a more complex behavior for the positive terminals. Larger, "fat" positive pins are often found on high-draw tools like vacuums or drills.
If your charger is flashing red (indicating a defect or hot battery), it is usually because it cannot communicate through the
: For DIY projects, many users only use the Positive (+) and Negative (-) terminals to run external devices, but some high-drain tools may require a connection to the TH or ID pins to function.
: Regulates battery parameters and safeguards the electronic circuitry during heavy loads. hart 20v battery pinout diagram better
A data connection that tells the tool or charger which specific battery type is connected to prevent overcharging or improper use. C (Control):
Lithium batteries have a low-voltage cutoff. If a battery is left drained for too long, its voltage may drop below what the charger recognizes as "safe". Some users "jump-start" these batteries by briefly connecting the terminals to another fully charged 20V battery to raise the voltage enough for the charger to take over. 3. Custom Adapters & Power Supplies
: Never bridge the Positive (+) and Negative (-) pins directly with a tool, wire, or metallic object. This causes immediate thermal runaway, sparking, or permanent cell damage.
: If a battery is drained too low, it may enter a "sleep" mode where it won't take a charge. The 4-Port Reset : According to HART Tools Support , you can often reset a 20V battery by placing it on a HART 4-Port Charger for a few minutes. When looking at the battery connector with the
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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
According to technical analysis, the Hart 20V battery features a (though often referred to in 3D modeling communities alongside 4-contact balance points internally): + (Positive Terminal): Main power output (20V nominal). - (Negative Terminal): Main ground/return. TH (Thermistor): Temperature Monitoring. ID (Identity/Control): Battery identification.
If you are building a custom adapter to use your HART 20V battery for other electronics, you only need to connect to the positive and negative terminals. Use a connector on the far left. Negative: Use a connector on the far right. : Regulates battery parameters and safeguards the electronic
) between TH and - to trick the tool into thinking the battery is at a safe temperature. ID (Identification)
The HART charger is a "smart" charger. When a battery is inserted, it performs a self-test. Power is connected. Flashing Red: Testing battery status. Flashing Green: Active charging. Solid Green: Fully charged.
Note: The outer large slots are the main B+ and B- power terminals. The inner small pins are T and ID.