About this replacement
Lenovo IdeaPad S340-13IML — 11.52V Li-Polymer Replacement Battery (5B10U95573)
This 11.52V, 3700mAh (42.62Wh) lithium-polymer battery replaces the original cell in the Lenovo IdeaPad S340-13IML. It fits the 81UM001GTA, 81UM000YKR, and 81UM000PJP variants under that model line. Cross-references OEM part numbers 5B10U95573, 5B10W67282, L18M3PFB, and SB10W67210.
- IdeaPad S340-13IML compatibility: All listed S340-13IML variants share the same 11.52V three-cell Li-Polymer configuration, identical connector pinout, and the same BMS handshake protocol — one cell fits all four model codes without modification.
- Bench tested on actual hardware: We cycled this cell through charge, load, and hibernate-cutoff on an S340-13IML unit. The BMS accepted the cell, charge current ramped correctly through CC/CV phases, and no fault codes triggered on the SMBus line.
- First-cycle reset after installation: After fitting this cell, run one full discharge down to hibernate cutoff — do not interrupt it — then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell chemistry and clears the inaccurate health warning that appears after every cell swap on this platform.
Laptop shutting down at 20–30% shown after battery swap
This happens because the fuel gauge IC is still reading state-of-charge against the old cell's discharge curve. Under combined CPU and display load, the new cell hits a voltage cliff earlier than the IC expects — the BMS sees the rail drop below the low-voltage threshold and cuts power instantly. The percentage shown on screen means nothing until two or three full calibration cycles complete. Run full discharges to hibernate, not manual shutdowns, so the IC can log the actual curve.
BIOS reporting battery health as poor or unknown after replacement
The BIOS reads health data from the EEPROM embedded in the battery's protection circuit. When a new cell goes in, the EEPROM starts fresh — cycle count and rated capacity data differ from what the BIOS logged for the old cell, so it flags a mismatch. This is not a fault with the cell. Run the battery learn cycle — discharge to hibernate, charge to 100% uninterrupted — and the BIOS will re-calibrate against the new EEPROM values. After one full cycle the health warning clears on most S340-13IML firmware versions.