Connect the battery's Ground (Pins 6/7) to the microcontroller's Ground.
| Pin | Label (Common) | Wire Color (Typical) | Function | | :--- | :--- | :--- | :--- | | 1 | P- (B-) | Black | Battery Negative / Ground | | 2 | P- (B-) | Black | Battery Negative / Ground | | 3 | SMBC | White or Yellow | SMBus Clock (I²C Clock) | | 4 | SMBD | White or Yellow | SMBus Data (I²C Data) | | 5 | PRES | Blue or Orange | Presence Detect / System Present | | 6 | P+ (B+) | Red | Battery Positive (11.55V – 12.6V) | | 7 | P+ (B+) | Red | Battery Positive (11.55V – 12.6V) |
The HP MU06 is one of the most widely used laptop battery models in hardware history. Powering generations of HP Pavilion, Compaq Presario, and HP Envy laptops, this 6-cell lithium-ion battery remains a frequent subject for repair technicians, electronics hobbyists, and hardware hackers.
It requires an activation signal on the System Presence or SMBus lines to wake up. Hp Mu06 Notebook Battery Pinout Configuration
Do not attempt to charge an MU06 battery by simply applying 12.6V to the positive and negative terminals. Lithium-ion batteries require a precise Constant Current / Constant Voltage (CC/CV) charging profile regulated by a smart charging controller that monitors cell balance and temperatures via the SMBus interface.
To "wake up" the battery and read its voltage, . This mimics the action of sliding the battery into a real laptop chassis. How to Safely Test and Bench-Charge the MU06
Advanced users can monitor SMBus communication using specialized tools such as bus pirates or logic analyzers. When probing the SMBus lines, proper pull-up resistor implementation is essential to obtain clean data signals. The SMBus protocol includes packet error checking (PEC) for reliable data transmission in noisy environments. For the HP MU06 battery, the specific SMBus slave address can be determined by sniffing the bus during system initialization or by reading the battery’s BMS (Battery Management System) documentation. Connect the battery's Ground (Pins 6/7) to the
If you probe Pin 1 and Pin 7 of a loose, functional HP MU06 battery with a multimeter, you will likely read . This is a built-in safety feature managed by the internal Battery Management System (BMS).
| Symptom | Likely Pinout Cause | |-----------------------------|--------------------------------------------| | Laptop powers only on AC | B+ pin corroded or broken | | Battery detected but 0% | SMBus data/clock stuck (BMS lock) | | “Plugged in, not charging” | TH pin open-circuit (no temp reading) | | Battery gets very hot | B+ sense line open → overcharging | | Random shutdown at 50% | Weak cell, but B+ voltage drop confuses EC |
| Pin | Signal Name | Function | Typical Voltage/Logic | |-----|--------------------|--------------------------------------------------------------------------|-------------------------------------| | 1 | | Battery positive terminal (cell series output) | 10.8V – 12.6V (3S Li-ion) | | 2 | B+ (sense) | Redundant positive sense line (for voltage drop compensation) | Same as B+ | | 3 | SMBC | SMBus clock line (I²C-compatible) | 3.3V pull-up, bi-directional | | 4 | SMBD | SMBus data line | 3.3V pull-up, bi-directional | | 5 | TH / T | Temperature sensor (NTC thermistor, 10kΩ at 25°C) | ~0.5–2.5V depending on temp | | 6 | NC or ID | Not connected (or battery ID resistor for charger detection) | 4.7kΩ – 10kΩ to ground | | 7 | B- / GND | Battery ground | 0V | | 8 | B- / GND | Second ground (current return for high power) | 0V | | 9 | B- / GND | Third ground (safety/redundancy) | 0V | It requires an activation signal on the System
Parallel to Pin 6, providing the second terminal for the 10.8V/11.1V positive rail. How to Safely Test and Measure the MU06 Battery
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