For formal setup and troubleshooting, refer to the HP MU06 User Guide on the HP Support Site .
The Kuzyatech Testing Guide provides a detailed breakdown of identifying pins using an oscilloscope and multimeter.
Before probing the connector, it is essential to understand what is inside the casing. The standard HP MU06 is a 6-cell Lithium-ion battery pack.
The battery is active, healthy, and the internal MOSFETs are unlatched. hp mu06 notebook battery pinout configuration link
=========================================== [ 1 | 2 | 3 | 4 | 5 | 6 | 7 ] =========================================== (+) (+) SCL SDA SYS (-) (-) Detailed Pin Assignment Table Pin Number Signal Name Description Typical Voltage / Behavior V+ (Positive) Main power output / charging input. 9.0V (fully discharged) to 12.6V (fully charged) Pin 2 V+ (Positive) Redundant power rail tied directly to Pin 1. Shared current load with Pin 1 Pin 3 SCL (Clock) SMBus/I2C serial clock line for data syncing. 3.3V logic level (requires external pull-up) Pin 4 SDA (Data) SMBus/I2C serial data line for info exchange. 3.3V logic level (requires external pull-up) Pin 5 SYS / ID System Present / Battery Detection pin. Must be tied to GND (Pin 6/7) to enable output Pin 6 GND (Ground) Main negative power return rail. 0V Reference Pin 7 GND (Ground) Redundant ground rail tied directly to Pin 6. Shared current load with Pin 6 3. Deep Dive into Special Pins Redundant Rails (Pins 1 & 2, Pins 6 & 7)
Connect to the SCL pin of your microcontroller.
This is the most critical pin for DIYers. For safety reasons, smart batteries do not output their full voltage at Pins 1 and 2 out of the box. If you put a voltmeter across Pin 1 and Pin 7 of a loose MU06 battery, you will likely read . For formal setup and troubleshooting, refer to the
Sometimes used to signal the laptop that the battery is physically docked. Positive (V+) The rightmost pins providing the main 10.8V or 11.1V power. Safety & Testing Tips
Usually dedicated to an internal thermistor for battery temperature monitoring. Pins 6 & 7:
These pins deliver the 10.8V-12.6V power to the motherboard. GND (Ground): The return path for the circuit. The standard HP MU06 is a 6-cell Lithium-ion battery pack
They communicate via SMBus , which allows the laptop to read real-time data like remaining capacity, cycle count, and health status. Diagnostic Tools: For advanced users, tools like the
The HP MU06 is typically a 6-cell Lithium-ion (Li-ion) battery pack. It generally carries a nominal voltage of with a capacity ranging from 47Wh to 55Wh (approx. 4200mAh to 5200mAh).
SMBus data line for digital communication with the laptop/charger controller. SMBC (Clock) SMBus clock line synchronized for data transmission. Pin 5 SYS / T (Thermistor)
Pins 4 (SCL) and 5 (SDA) operate on standard I2C/SMBus logic levels (typically 3.3V). They communicate with the laptop's embedded controller (EC). The "Safety Lock" Feature (Why you might read 0 Volts)
Measure the voltage of the three parallel pairs individually.