Connect the to your microcontroller’s SDA pin.
This is the most critical section for anyone looking to interface directly with the battery. The HP MU06 battery uses a (though not all pins are always used) to communicate and deliver power to the laptop. Based on reliable information drawn from laptop schematics and confirmed by electronics experts, the pinout for the MU06 battery follows a standardized "smart battery" configuration.
Because of the locked BMS issue, attempting to rebuild an HP MU06 battery is extremely difficult and rarely successful for a hobbyist. For almost all users, purchasing a new, high-quality replacement battery is the safest, easiest, and most reliable path.
Lithium-ion battery packs store massive amounts of energy in a highly volatile chemical environment. When working with the HP MU06 pinout link, always observe the following rules:
Using standard Arduino I2C libraries (like Wire.h ), you can query standard smart battery registers (such as address 0x0B ) to read out raw telemetry data. Safety Guidelines and Warnings
A crucial safety link. The battery will not discharge or charge on your workbench unless this specific pin is safely pulled down to the ground (GND), signaling that it is actively locked into a laptop.