About this replacement
Lenovo IdeaPad 5 14 Series — 11.55V Li-Polymer Replacement Battery (5B10W86957)
This 11.55V, 4900mAh (56.6Wh) Li-Polymer battery replaces the original cell in the Lenovo IdeaPad 5 14, IdeaPad 5 14ARE, IdeaPad Slim5-14IIL, and XIAOXIN Air 14 2020, among other models in this lineup. It matches the OEM voltage rail, connector pinout, and physical dimensions (293.36 × 83.35 × 7.00mm) of the original pack. Swap it when the factory cell no longer holds enough charge for portable use.
- IdeaPad 5 14 platform fit: The IdeaPad 5 14 lineup — including ARE, IIL, and XIAOXIN Air 14 2020 variants — shares a common battery bay dimension, three-cell Li-Polymer architecture, and the same BMS communication protocol over the SMBus interface. That is why one part number covers all these models.
- Bench tested on actual hardware: We ran this cell on an IdeaPad 5 14 chassis and confirmed the BMS handshake completed without fault codes. The charge controller accepted the full 56.6Wh rated capacity and the fuel gauge IC registered correct state-of-charge data after two conditioning cycles.
- First-cycle reset on the IdeaPad 5 14: After installing, run one full discharge down to the hibernate cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to clear stale EEPROM data from the old cell and corrects the inaccurate health warning that appears immediately after every cell swap on this platform.
Laptop shutting down at 20–30% shown after battery swap
This happens when the fuel gauge IC still holds calibration data from the old, degraded cell. The IdeaPad 5 14's embedded controller maps percentage to voltage curves it learned from the previous pack. Under full CPU and display load, voltage drops faster than the old curve predicts, hitting the hardware cutoff before the gauge reaches 0%. The fix is two full discharge-to-hibernate cycles, which force the EC to rebuild its voltage-to-capacity map against the new cell. After the second cycle, the shutdown point should align with the actual remaining charge — confirm by watching cell voltage stay above 10.8V at the point the system previously cut out.
BIOS reporting battery health as poor or "unknown" after replacement
The Lenovo BIOS reads health status and cycle count from EEPROM data stored on the battery's BMS board. When a new cell goes in, that EEPROM carries its factory-default values, which the BIOS can flag as mismatched against its stored baseline for the old pack. This is not a fault with the replacement cell. Run the battery learn cycle — full discharge to hibernate, then a single uninterrupted charge to 100% — and restart the laptop. The BIOS will re-read the updated EEPROM data and clear the warning on the next boot.