About this replacement
Lenovo IdeaPad S340 / ThinkBook 14 — 11.4V Li-Polymer Replacement Battery (5B10T09093)
This is an 11.4V, 3200mAh (36.48Wh) lithium-polymer battery for the Lenovo IdeaPad S340 series and ThinkBook 14 laptops. It replaces OEM part numbers 5B10T09093, L18L3PF2, L19M3PF0, L19M3PF1, L19D3PF2, and several SB10 variants. The cell fits the IdeaPad S340-15IWL Touch and ThinkBook 14 20RV000ACD and 20RV000GCD configurations.
- IdeaPad S340 and ThinkBook 14 platform fit: Both the IdeaPad S340 series and ThinkBook 14 share the same 11.4V three-cell Li-Polymer architecture, connector pinout, and BMS handshake protocol — so one cell covers both chassis without modification.
- Bench tested on actual hardware: We ran this cell on an IdeaPad S340-15IWL and confirmed the BMS initialised correctly, charge current stepped down normally at the 80% threshold, and the BIOS reported cell voltage within spec across a full charge cycle.
- Post-install calibration on the S340: After fitting, let the battery discharge fully to hibernate cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap on this platform.
Why the IdeaPad S340 shuts down at 20–30% after a battery swap
The S340's fuel gauge IC built up a discharge curve model from the old, degraded cell. After a swap, that stored model still drives the state-of-charge calculation. When the new cell's actual voltage hits a point the old model treats as near-empty, Windows triggers shutdown — even though the cell has usable capacity left. Running two or three full discharge-to-hibernate cycles recalibrates the fuel gauge IC against the new cell's chemistry. After calibration, the reported percentage tracks actual cell voltage accurately.
BIOS shows "poor battery health" immediately after fitting a new cell
The Lenovo BIOS reads health data from the battery's EEPROM. A new cell ships with factory EEPROM values that don't match the discharge history the BIOS expects — so it flags the battery as degraded. This is a data mismatch, not a fault with the cell. Run the battery learn cycle: discharge to automatic hibernate, then charge to 100% without interruption. After one complete cycle, the BIOS resets the health register and the warning clears. If it persists, check BIOS version — some S340 firmware builds below version ASCN35WW misread Li-Polymer EEPROM data and require a firmware update to 11.4V cell tolerance.