It’s easy to confuse the MU06 with similar HP batteries:
| Battery Model | Pin Count | Voltage | Compatibility warning | |---------------|-----------|---------|------------------------| | MU06 | 7-pin | 11.55V | Pavilion x360 14, 15s | | MU09 | 7-pin | 11.55V | Larger capacity, same pinout | | HT03 | 6-pin | 11.4V | Different latch position – will not fit | | KC06 | 5-pin | 7.6V | 2S configuration – do not interchange |
Always check the HP spare part number (e.g., L83772-2C1) before assuming pinout compatibility. Hp Mu06 Notebook Battery Pinout Configuration
| Symptom | Likely Issue | Pinout Check | | :--- | :--- | :--- | | Laptop runs on AC but doesn't see battery | No communication | Measure voltage on Pin 2 & 3 (should be ~3.3V with pull-ups inside laptop). Check Pin 4 resistance to Pin 5 (~10kΩ). | | Battery charges to 0% only | Failed cell or BMS lock | Check Pin 1 to Pin 5 voltage (should be >10V if cells are healthy). | | Battery detected but won't charge | B+ shorted to B- internally | Check resistance Pin 1 to Pin 5 (should be >100kΩ when idle; not a short). | | Laptop shuts down randomly on battery | High resistance on B- path | Check Pin 5 connection (should be <0.1Ω to laptop 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) | It’s easy to confuse the MU06 with similar
To fully grasp the pinout, you must understand what lies inside the HP MU06 pack:
+-------------+ +-------------------+ +------------+
| Cell 1 (4.2V|----+ | Protection Circuit | | Connector |
| Cell 2 (4.2V| | | & Gas Gauge (BQ40Z50| | Pin 6/7 B+ |
| Cell 3 (4.2V|----+ | or similar) |----+ | Pin 1/2 GND|
+-------------+ | | | | |
| | - Overvoltage | | | Pin 3 SMBC |
+-------------| - Undervoltage | +--| Pin 4 SMBD |
| - Overcurrent | | Pin 5 TH |
| - Short-circuit | +------------+
+-------------------+
The gas gauge IC (commonly Texas Instruments BQ40Z50-R1 or BQ3060) monitors individual cell voltages via internal balancing resistors. It communicates SMBus data over Pins 3 & 4. The gas gauge IC (commonly Texas Instruments BQ40Z50-R1
Critical note: The battery’s protection FETs are normally open when the battery is disconnected. Only after receiving the correct SMBus command from the laptop’s EC do the FETs close, delivering power to Pins 6 & 7. This is why a fully charged MU06 battery shows 0V on Pins 6 & 7 when unplugged from the laptop.
