Battery Pinout Configuration — Hp Mu06 Notebook

Pin layout (left-to-right when the battery contact side faces you, contacts exposed upward):

5. Critical Operating Notes

5.1. No Direct Power from PRES

• Do not apply external voltage to Pin 5 (PRES). It is a signal output, not a power input.

| Measurement Points | Expected Voltage (Standalone) | Expected Voltage (In Laptop, AC Present) | |----------------------|-------------------------------|-------------------------------------------| | Pin 6 to Pin 1 | 0V (FETs open) or 10.8–12.6V (rare if not locked) | 11–13V (charging) / 9–12V (discharging) | | Pin 3 (SMBC) to GND | 0V (no pull-up) | 3.3V | | Pin 4 (SMBD) to GND | 0V | 3.3V fluctuating (data activity) | | Pin 5 (TH) to GND | 10 kΩ to 100 kΩ (resistance) | 0.5V–2.5V (depending on temperature) | Hp Mu06 Notebook Battery Pinout Configuration

Example SMBus registers commonly used (conceptual)

• Manufacturer name / Model
• Serial number
• Design capacity / Full charge capacity (FCC)
• Voltage / Current / Temperature
• State-of-charge (SoC)
• Cycle count / Pack status flags

• Individual cell voltage drops below ~2.0V for > 30 seconds.
• A short circuit is detected on P+ or P-.
• The SMBus writes an invalid unlock sequence.

| Pin Number | Label / Name | Description | Function | | :--- | :--- | :--- | :--- | | 1 | PACK+ | Positive Terminal | Main positive voltage output. Connects to the positive end of the cell array. | | 2 | PACK+ | Positive Terminal | Main positive voltage output (often bridged to Pin 1 for higher current handling). | | 3 | ID / TH | Thermistor / ID | Connects to an internal NTC thermistor. Used by the laptop to monitor battery temperature. Often serves a dual purpose as a security ID line. | | 4 | CLK | Clock (SCL) | I²C Serial Clock line. Used for SMBus communication between the battery BMS and the laptop EC (Embedded Controller). | | 5 | DATA | Data (SDA) | I²C Serial Data line. Transmits capacity, cycle count, and voltage data to the OS. | | 6 | SYS PRES | System Present | Often a logic signal indicating the battery is fully inserted. Usually pulled low or high depending on the circuit design. | | 7 | NC / ALM | No Connect / Alarm | Often unused (NC) or used for safety alerts. Can be a secondary temperature sensor in some revisions. | | 8 | PACK- | Negative Terminal | Main ground/negative output. Connects to the negative end of the cell array. | | 9 | PACK- | Negative Terminal | Main ground/negative output (bridged to Pin 8). | Pin layout (left-to-right when the battery contact side

Controller Chip: Many MU06 batteries utilize the Texas Instruments BQ20Z40 or BQ20Z45 gas gauge chip. This chip monitors cell health and can "lock" the battery (Permanent Failure bit) if it detects cell imbalance or extreme depletion. Do not apply external voltage to Pin 5 (PRES)