About this replacement
Lenovo IdeaPad Yoga 11 Series — 14.8V Li-Polymer Replacement Battery (L11M4P13)
This is a 14.8V, 2840mAh Li-Polymer replacement battery for the Lenovo IdeaPad Yoga 11 and Yoga 11S convertible notebook line. It uses OEM part number L11M4P13 and fits the hinge-based 360° convertible form factor where the battery sits flat across the lower chassis. Voltage and capacity match the original Lenovo specification exactly.
- Yoga 11 and 11S platform fit: These models share the same 14.8V four-cell Li-Polymer battery rail, connector pinout, and BMS handshake protocol. The Yoga11S-IFI and Yoga11S-IFI(U) variants use the same L11M4P13 cell configuration, so one part number covers the full series without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on Yoga 11S hardware. The BMS negotiated correctly with the Lenovo EC firmware, reported accurate State of Charge data, and held stable voltage under combined CPU and display load without tripping an early cutoff.
- BIOS battery learn cycle after install: After fitting this cell, run the laptop down to hibernate cutoff under normal load, then charge uninterrupted to 100%. This forces the BIOS to run a full learn cycle against the new cell and clears the inaccurate health warning that appears after every cell swap.
Yoga 11 shutting down at 20–30% remaining after battery swap
This happens because the fuel gauge IC is still calibrated to the discharge curve of the old, degraded cell. When the new cell hits a voltage zone the IC associates with depletion, it signals a forced shutdown — even though real capacity remains. The fix is two to three full discharge-to-hibernate and uninterrupted-charge cycles. After that, the fuel gauge IC recalibrates its curve to the new cell chemistry and the early shutdowns stop.
BIOS reporting battery health as poor or unknown immediately after fitting
The Lenovo BIOS reads health data from the EEPROM embedded in the battery's BMS circuit. A new cell ships with factory EEPROM values that do not match the accumulated cycle data the BIOS was tracking on the old cell, so it flags the reading as poor or unknown. This is not a fault with the replacement cell. Run one full discharge-to-hibernate followed by a complete charge to 100% — the BIOS learn cycle will write fresh baseline values to the EEPROM and the health warning will clear.