Synchronizes data transmission between the laptop and the battery.
HP MU06 notebook battery is a widely used Li-ion battery pack with a standard 9-pin blade connector
If you'd like to narrow down your troubleshooting, let me know: Hp Mu06 Notebook Battery Pinout Configuration
. While HP does not officially publish pinout diagrams for consumers, technical analysis and motherboard schematics define the configuration as follows: Pinout Configuration (9-Pin Layout)
The SMBD (Data) and SMBC (Clock) pins allow the battery's internal Texas Instruments (or similar) Fuel Gauge IC to talk to the laptop's Embedded Controller (EC). Through these lines, the laptop reads data such as: Remaining capacity percentage Current temperature of the cells Total cycle count Serial number and manufacturer data Synchronizes data transmission between the laptop and the
The internal BMS microchip features an electronic fuse (chemical fuse). If the BMS detects an unbalance in cell voltages, a severe over-current, or if you accidentally reverse-bias the pins while trying to charge it externally, the chip will permanently blow the internal fuse. Once triggered, the battery is safely "bricked" and will never output voltage again, even if the lithium cells inside are perfectly healthy.
If the reading is even with Pin 5 grounded, the internal fuse is blown, or the BMS has locked out due to over-discharge protection. Technical Specifications of the HP MU06 Through these lines, the laptop reads data such
Add from both the SDA and SCL lines to a 3.3V power source, as the SMBus protocol requires pull-ups to transmit data cleanly. Safety Warning
| Pin # | Signal | Voltage / Function | Wire Color (Typical) | | :--- | :--- | :--- | :--- | | | B+ | Battery Positive (+11.4V to +12.6V) | Red or Black/Red stripe | | 2 | SMBC | System Management Bus (Clock) | White or Yellow | | 3 | SMBD | System Management Bus (Data) | Gray or Blue | | 4 | PRES | Presence Detect (Ground via 10kΩ resistor inside battery) | Orange or Brown | | 5 | B- | Battery Negative (Ground / 0V) | Black |
💡 If you are testing for voltage with a multimeter and get 0V across the outer pins, the internal protection circuit is likely engaged. You may need to apply a small "wake-up" voltage (around 9V) briefly to see if the BMS (Battery Management System) resets.
The interface for the MU06 battery is typically a , though only 5 to 6 pins are actively used for power and data communication.