About this replacement
Lenovo IdeaPad 1-11IGL05 / 1-14IGL05 — 7.5V Li-Polymer Replacement Battery (L19C2PF1)
This is a 7.5V, 4100mAh (30.75Wh) Li-Polymer battery for the Lenovo IdeaPad 1-11IGL05, IdeaPad 1-14IGL05, and the broader IdeaPad 1 series. It replaces OEM part numbers L19C2PF1, L19M2PF1, L19L2PF1, SB10W42962, and several related 5B10W codes. If your original cell has degraded, swollen, or stopped holding charge, this swap restores full unplugged use.
- IdeaPad 1 series compatibility: The 11-inch and 14-inch IdeaPad 1 variants share the same 7.5V two-cell Li-Polymer architecture, connector pinout, and BMS handshake protocol — which is why one part number family covers both chassis sizes. The physical footprint at 210.00 × 161.30 × 3.90mm fits the internal tray on both.
- Bench tested on actual hardware: We ran this cell through charge-discharge cycles under simulated CPU and display load. The BMS held voltage within spec across the full state-of-charge range, and the protection circuit tripped correctly at both over-voltage and under-voltage thresholds.
- Post-install calibration on IdeaPad 1: After fitting, discharge the laptop fully until it hibernates, then charge uninterrupted to 100% without interruption. This single learn cycle resets the BIOS fuel gauge against the new cell and clears the inaccurate battery health warning that almost always appears after a cell swap on this platform.
BIOS reporting poor battery health immediately after replacement
The IdeaPad 1 BIOS stores battery health data from the old cell's EEPROM and doesn't automatically wipe it when a new cell is fitted. On first boot, it reads stale cycle-count and capacity data from the previous battery's history and flags the new cell as degraded. This is a firmware read issue, not a fault with the replacement cell. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% — after that cycle, the BIOS recalibrates and the health warning clears.
Laptop shutting down at 20–30% remaining shown on screen
This happens when the fuel gauge IC hasn't yet mapped its charge curve to the new cell's actual voltage profile. Under combined CPU and display load, the cell hits a voltage cliff that the uncalibrated gauge doesn't predict — the system reads 25% but the cell voltage has already dropped below the safe cutoff. The OS shuts down to protect the cell before the displayed percentage reaches zero. Complete two full discharge-to-hibernate and full-recharge cycles; the gauge IC recalibrates its discharge curve against the new cell and the premature shutdowns stop. Target cell voltage at full charge: 8.4V.