Hart 20v Battery Pinout Diagram ❲EXTENDED ●❳
Never bridge the and (-) pins with raw wires or metal objects. Doing so can bypass certain external safety features, melt the terminal housing, blow the internal permanent fuse, or rupture the cells. Custom DIY Applications and Power Adapters
: The fourth slot from the left (on specific models). This assists the smart charger in managing cell balance during the charging cycle.
Ultimate Hart 20V Battery Pinout Diagram & Technical Guide Understanding the pinout of your Hart 20V Lithium-Ion battery is essential for DIY projects, custom power adapters, or troubleshooting charging issues. Hart 20V tools—sold primarily at Walmart—are manufactured by TTI (Techtronic Industries). They share a highly stable, five-pin battery architecture designed for power delivery, thermal monitoring, and cell balancing.
To draw power, you only need to connect to the and Negative (-) pins. You can purchase 3D-printed plastic battery adapters online that include pre-installed metal blades for these two slots. The Low-Voltage Cutoff Danger
For the average user, this complexity is invisible, but it is the reason the batteries can be charged quickly, used safely, and last for years. For the technically inclined DIYer, understanding this pinout is the first step toward diagnostics, repair, and legitimate custom applications. Always prioritize safety when working with these high-energy devices and respect the proprietary intelligence built into every Hart 20V battery pack. Hart 20v Battery Pinout Diagram
The diagram below illustrates the typical arrangement of the five terminals on the Hart 20V battery pack. Understanding the function of each terminal is key to understanding how the battery system operates.
[B+ (T1)] ----[Cell 5+] | [Cell Group] | [B- (T5)] ----[Cell 1-] ----+ | [T3 (ID)] ------------------+ (resistor to B-) | [T2 (Thermistor)] -----[NTC]----+ | [B-]
, allowing the charger to monitor and equalize the voltage across individual cell groups (approx. 4V increments). DIY & Safety Considerations For those using these batteries for custom projects or DIY adapters Low Voltage Protection:
terminals, often with 12–14 AWG wire and a 30A fuse for safety. Resetting: Never bridge the and (-) pins with raw
Do you need assistance calculating the proper for your project load?
Crucial for charging; can be left open for low-draw DIY tools. Inner Slot Data exchange with the charger
If you measure the Control pin and get 20V in relation to Positive, and 0V in relation to Negative, this usually indicates the BMS has cut off the output due to a safety fault or low voltage.
Hart 20V batteries utilize a standard slide-on interface featuring four or five physical slot terminals, depending on the specific battery generation and amp-hour (Ah) capacity. This assists the smart charger in managing cell
Unlike some brands that build the low-voltage shutdown circuitry directly inside the battery pack, Hart places a significant portion of this protection inside the . The battery BMS will protect against extreme over-current or short circuits, but it may allow a custom DIY load to drain the cells all the way to 0V.
, ensuring each internal lithium-ion cell stays at a safe, equal voltage (roughly 4V increments: 4V, 8V, 12V, 16V relative to Negative). Safety and Compatibility Resetting:
If you are tapping into a Hart 20V battery to power non-Hart devices (such as robotics, Power Wheels modifications, or custom LED lighting setups), keep these critical factors in mind: Drawing Power (Discharging)