About this replacement
Lenovo IdeaPad Y430 Series — 11.1V Li-ion Replacement Battery (L08S6D01)
This is an 11.1V, 4400mAh (48.84Wh) lithium-ion battery for the Lenovo IdeaPad Y430 notebook. It fits the Y430, Y430g, Y430a, and Y430 2781 variants, among others. OEM part numbers covered include L08S6D01, L08O6D01, and L08O6D02.
- Y430 platform compatibility: All Y430 variants in this lineup share the same 11.1V three-cell configuration, connector pinout, and BMS handshake protocol. The battery slots into any of these models without modification.
- Bench tested on actual hardware: We cycled this cell on a Y430 mainboard and confirmed the BMS communicates charge state correctly. The protection circuit trips as expected on undervoltage, and charge termination holds at the correct cutoff.
- Post-install calibration on the Y430: After fitting this battery, run one full discharge until the laptop hibernates on its own, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting poor battery health immediately after fitting a new cell
The IdeaPad Y430 BIOS reads health data stored in the battery's EEPROM, not from live cell measurements. When a new battery arrives, that EEPROM data reflects the factory-calibrated baseline, which the BIOS often misreads as degraded until a learn cycle runs. This is not a fault with the replacement cell. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% — the BIOS will update its health register and the warning clears.
Laptop shuts down at 20–30% charge shown on screen
This happens when the fuel gauge IC is still calibrated against the old, degraded cell rather than the new one. The gauge reports 20–30% remaining, but the new cell's voltage curve sits in a different place than the worn cell it replaced. Under full CPU and display load, the voltage drops faster than the gauge predicts, and the system cuts power before reaching zero. Two to three full discharge-and-charge cycles re-aligns the fuel gauge IC to the new cell's actual voltage profile.