Lenovo Yoga 300-11IBR Replacement Battery 7.4V 3950mAh

Lenovo Yoga 300-11IBR — 7.4V Li-Polymer Replacement Battery (L14M2P22)

This 7.4V, 3950mAh (29.23Wh) Li-Polymer battery replaces the original cell in the Lenovo Yoga 300-11IBR convertible notebook and closely related models including the IdeaPad 300S-11IBR and Flex 3-1120. It cross-references OEM part numbers L14M2P22, L14S2P21, 5B10H09630, 5B10H09632, 5B10H11758, 5B10K10168, 5B10K10179, and 5B10K10228. Voltage, connector pinout, and physical dimensions match the original pack specification.

• Yoga 300 / IdeaPad 300S / Flex 3-1120 platform fit: These three model lines share the same 7.4V two-cell Li-Polymer architecture, identical 127.40 × 112.12 × 6.40mm envelope, and the same BMS handshake protocol. One cell covers all of them without wiring or connector modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a Yoga 300-11IBR mainboard. The BMS accepted the new cell, charge termination triggered correctly at full voltage, and the fuel gauge IC initialised without error after a calibration cycle.
• Post-install calibration on the Yoga 300: After fitting, run one full discharge down to automatic hibernate-cutoff, then charge uninterrupted to 100% without interruption. This forces the BIOS battery learn cycle to reset against the new cell data and clears the inaccurate health warning that appears on first boot after any cell swap.

Why the Yoga 300-11IBR BIOS reports poor battery health after a cell swap

The Yoga 300 BIOS reads health data stored in the original cell's EEPROM — cycle count, full-charge capacity, and wear percentage accumulated over its service life. When a new cell goes in, that EEPROM data does not automatically reset, so the BIOS presents the old cell's worn figures as current health. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% triggers the learn cycle and overwrites the stale EEPROM values. After two to three full cycles, the fuel gauge IC recalibrates and the health warning clears.

Laptop shuts down at 20–30% remaining after battery swap

This happens because the fuel gauge IC is still using the old cell's voltage-to-capacity curve. The new cell hits a steeper voltage drop under combined CPU and display load than the IC expects at that state of charge, so the system interprets it as critically low and shuts down. It is not a faulty cell — it is a calibration mismatch. Run two full discharge cycles down to hibernate-cutoff and charge to 100% each time. By the third cycle the gauge IC has mapped the actual voltage curve of the new cell and the early shutdowns stop.