About this replacement
Lenovo Yoga 3 Pro 11 — 7.6V Li-Polymer Replacement Battery (L14L4P71)
This 7.6V, 4400mAh Li-Polymer cell replaces the original L14L4P71 battery in the Lenovo Yoga 3 Pro 11 convertible ultrabook. It fits the 11-inch 360-degree hinge models, including the 80J80021US and Yoga 3 11-5Y10. Capacity figures are taken directly from the product specification — 33.44Wh at 7.6V nominal.
- Yoga 3 Pro 11 and 80J8 series fitment: These models share the same 7.6V two-cell Li-Polymer voltage rail, identical connector pinout, and the same BMS handshake protocol — that is why one cell covers both the 80J8001XGE and the 80J80021US without any modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Yoga 3 Pro 11 unit. The BMS negotiated correctly, charge termination triggered at full voltage, and no fault codes were thrown during the cycle.
- Post-install calibration on the Yoga 3 Pro 11: After fitting, 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 a cell swap — skipping this step leaves the fuel gauge IC reading against the old cell's EEPROM data.
Why the Yoga 3 Pro 11 shuts down at 20–30% after a battery swap
The Yoga 3 Pro 11 runs a 5Y10 Core M processor alongside a high-resolution display — that combined load pulls significantly more current than idle. A new cell that has not been calibrated holds accurate open-circuit voltage readings but cannot yet model its own internal resistance under load. When current draw spikes, cell voltage sags below the BMS cutoff threshold faster than the fuel gauge predicts, triggering an abrupt shutdown. One full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% gives the fuel gauge IC the reference data it needs to track voltage sag correctly.
BIOS reporting the replacement cell as poor health or 0% on first boot
The Lenovo BIOS reads battery health from EEPROM data embedded in the original cell — after a swap, it compares the new cell's reported parameters against a stored baseline that no longer matches. This produces a "poor health" or "replace battery" flag even on a brand-new cell. The fix is not a firmware update. Run the battery learn cycle: discharge fully to hibernate cutoff, then charge to 100% without interruption. After one complete cycle the BIOS recalibrates against the new cell and the warning clears at the next boot — confirm the reading in Lenovo Vantage or by checking the BIOS power screen where charge should now show above 95%.