About this replacement
Lenovo IdeaPad S10-3 — 11.1V Li-ion Replacement Battery (L09S6Y14)
This is an 11.1V, 4400mAh (48.84Wh) Li-ion battery for the Lenovo IdeaPad S10-3 netbook. It replaces OEM part numbers L09S6Y14, L09M6Y14, L09C6Y14, and the full 57Y6xxx and 121000xxx series. Fits S10-3 variants including the 06474CU and 064735U builds.
- S10-3 variant coverage: The S10-3 line spans multiple sub-models — 0647, 06474CU, 064735U among them — but all share the same 11.1V three-cell rail and the same connector footprint. The BMS handshake protocol is consistent across this platform, so one cell spec covers the full range.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an S10-3 unit. The BMS communicated correctly with the EC firmware, charge current ramped normally through CC/CV stages, and no protection tripping occurred at idle or moderate CPU load.
- Post-install calibration on the S10-3: After fitting this cell, run the netbook down to hibernate-cutoff on battery only — no AC — then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the false "poor health" warning that appears immediately after any cell swap on this platform.
BIOS reporting battery health as poor after replacement on the S10-3
The S10-3 EC reads health data from the battery's EEPROM on first contact. When a new cell arrives, that EEPROM data doesn't match the discharge history the BIOS expects, so it flags the battery as degraded — even when the cell is brand new. This is not a fault with the replacement cell. One full discharge-to-hibernate followed by an uninterrupted charge to 100% resets the learn cycle. After two to three cycles, the BIOS health readout normalises.
IdeaPad S10-3 shutting down at 20–30% charge shown
The fuel gauge IC on the S10-3 calibrates against the original cell's discharge curve. Fit a new cell and the IC's stored curve no longer matches actual cell chemistry, so the percentage readout drifts — the system hits a voltage floor the IC doesn't recognise and shuts down before the displayed figure reaches zero. The fix is calibration: discharge fully to hibernate, charge to 100% without interruption, repeat twice. By the third cycle the fuel gauge IC has mapped the new cell's voltage curve and the shutdown-at-30% behaviour stops. Check that battery voltage under light load reads above 10.8V at the point the shutdown previously triggered — anything below that confirms the old cell data was the cause.