About this replacement
Lenovo Yoga S750-14 Pro — 15.44V Li-Polymer Replacement Battery (L19C4PH3)
This 15.44V, 3850mAh (59.44Wh) Li-Polymer battery replaces the original L19C4PH3 cell in the Lenovo Yoga S750-14 Pro and Yoga Slim 7 Pro 14ACH5 series. The pack dimensions are 290.34 × 89.60 × 5.60mm, matching the original footprint inside the chassis. Compatible OEM part numbers include L19D4PH3, L19M4PH3, 5B10Z49514, 5B10Z49518, 5B10Z49519, and SSB10Z49515.
- Yoga S750-14 Pro and Slim 7 Pro 14ACH5 compatibility: These models share the same 15.44V four-cell battery rail, connector pinout, and BMS handshake protocol. Any variant carrying an L19-series part number will accept this pack without modification.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a Yoga Slim 7 Pro 14ACH5 unit. The BMS handshake completed normally, charge accepted without interruption, and the protection circuit triggered correctly at the low-voltage cutoff threshold.
- Post-install calibration for the Yoga S750-14 Pro: After fitting this battery, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.
BIOS reporting battery health as poor immediately after replacement
Lenovo's embedded controller reads cycle count, charge history, and rated capacity from EEPROM data stored in the outgoing cell. When a new cell is installed, that EEPROM register is blank or carries mismatched values, so the BIOS flags the battery as degraded before it has run a single cycle. This is a firmware interpretation issue, not a cell fault. Run one complete discharge-to-hibernate followed by a full uninterrupted charge. After two to three cycles the fuel gauge IC recalibrates against the new cell chemistry and the health status normalises.
Laptop shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC still holds calibration data from the old, degraded cell. The percentage readout appears stable, but the new cell hits a voltage cliff under combined CPU and display load that the uncalibrated gauge did not anticipate. The system interprets the sudden voltage drop as a critical low-battery event and shuts down to protect the hardware. To fix it, fully discharge to hibernate-cutoff — do not force-shutdown — then charge to 100% without interruption. Repeat this cycle twice more until the gauge tracks accurately against real cell voltage.