Pinout Diagram - Hart 20v Battery

When using these for DIY projects, always include an inline fuse. For example, Power Wheels Adapters often come with 30A fuses to protect the battery cells from over-current damage.

The standard Hart 20V battery interface consists of five primary terminals. When looking at the battery with the connectors facing you, the layout generally follows this identification: The main power output terminal.

If your battery flashes specific patterns on its Built-in Fuel Gauge , it may indicate a temperature out-of-range error or a permanent cell failure. Hart 20v Battery Pinout Diagram

A communication or control pin often used for low-voltage protection or signaling.

For those troubleshooting or building Battery Adapters , standard voltage readings between pins (at full charge) are as follows: Pin Connection Voltage Reading ~20V (18V nominal) Main power supply (+) to TH High-side temperature monitor (-) to TH Ground reference for thermal sensing (-) to ID Ground reference for ID resistor (-) to C Control signal path Internal Balanced Charging Pins When using these for DIY projects, always include

Used for temperature monitoring to prevent overheating during use or charging.

Are you looking to or are you trying to bypass the protection circuit for a specific project? Hart 20v Battery Pinout Wiring Diagram When looking at the battery with the connectors

Allows the tool or charger to identify the battery type and capacity.

Many Hart tools have a "fat" positive pin designed to detect low voltage. If you are using an adapter for a non-Hart tool, you may need to bridge certain pins to prevent the battery from cutting out prematurely.