Used for data exchange between the battery's internal gas gauge (often a BQ20Z40 or BQ20Z45 chip) and the laptop motherboard. SCL (Clock): Pin 3 SDA (Data): Pin 4
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Note: On some variations, the numbering may be reversed depending on the orientation of the connector (left-to-right vs. right-to-left). Always use a multimeter to verify Ground (which will show 0 ohms to the battery's negative terminal) and Positive pins before applying power. Technical Specifications Lithium-ion (Li-ion) Used for data exchange between the battery's internal