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.
Looking directly at the battery terminal slots with the latch facing away from you, the pin configuration is laid out as follows: Hart 20v Battery Pinout Diagram
Because TTI manufactures both brands, Hart 20V batteries share an identical internal electronic architecture with Ryobi 18V One+ batteries. However, the physical plastic housings and slide-on rails are intentionally designed differently to prevent direct physical swapping. Using Hart 20V Batteries for DIY Projects The standard Hart 20V battery interface consists of
. These aren't just for show; they are the "balance leads" used during charging to ensure every individual cell inside the pack stays at the same voltage—roughly 4V, 8V, 12V, and 16V respectively. A Spark of Life Max remembered a trick from the Hart community However, the physical plastic housings and slide-on rails
: The middle slot. Used by smart chargers and specific high-draw tools to identify the battery capacity, cell chemistry, and generation.
The ground or common return path for the circuit. Voltage Measurements & Technical Specs
Ensures one cell doesn't drain faster than the others.