If you are designing a 3D-printed adapter for the Hart 20V system, keep these tips in mind:
The pinout for a typically consists of 5 main pins plus several internal contact points for balanced charging. When looking at the battery with the connector facing you, the layout generally follows this configuration:
The Hart 20V battery pinout diagram consists of the following pins:
Working with lithium-ion batteries involves serious risks. They store a significant amount of energy, and mishandling can lead to short circuits, fires, or explosions. Before you start:
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 your battery is at room temperature but refuses to charge, it may require a reset. This can often be done by placing it on a Hart 4-Port Fast Charger for several minutes. Charging Speed : Using a standard 2-Amp Fast Charger , a depleted battery typically takes between 30 to 60 minutes to reach full capacity. Compatibility
: These are balance contact points found inside the terminal area. They allow the charger to monitor the exact voltage of each of the five individual cell groups to ensure they charge evenly. Voltage Reference Guide
If you want to use a HART 20V battery to power an LED strip, a portable soldering iron, or a 3D-printed power station, you mainly need the and (-) terminals. However, be warned: most HART tools have the Low Voltage Cutoff (LVC) built into the tool , not the battery. If you run a device directly off the pins without a protection circuit, you risk draining the battery below 15V, which can permanently "brick" the cells. 2. Troubleshooting "Dead" Batteries
If the battery feels extremely hot during use, allow it to cool before placing it on the charger, as the charger will report a "Temperature Out of Range" error. HART 20V Battery Charging Behavior
: A communication line often used for system control or balanced charging signals. Negative (-) : The main high-power ground terminal. Voltage Readings for Verification
To get the most out of your Hart 20V battery, follow these tips:
Understanding the is essential for DIY diagnostics, custom electronics projects, and building battery adapters. The Hart 20V lithium-ion battery contains five primary terminal pins designed to transfer power, monitor internal temperatures, and communicate with official tools and chargers.