About this replacement
NEC Lavie N PC-LN300CD Series — 11.1V Li-ion Replacement Battery (OP-570-76310)
This is an 11.1V, 4800mAh (53.28Wh) Li-ion battery for the NEC Lavie N notebook range. It fits the PC-LN300CD, PC-LN500CD, PC-LN5009DW, Versa S3000-725CMH, and over fifteen additional Lavie N variants. OEM part numbers OP-570-76310 and PC-VP-BP37 both apply to this cell.
- Lavie N and Versa S3000 compatibility: These models share a common 11.1V three-cell architecture, the same 9-pin SMBus connector, and a BMS handshake protocol that reads EEPROM data from the pack. One cell fits the full cluster without connector adaptation or firmware changes.
- Bench tested on actual hardware: We cycled this pack through full charge and discharge on a Lavie N platform. The BMS communicated charge state correctly across all three cells, and the protection circuit tripped at the expected low-voltage threshold without triggering a hard fault.
- Post-install calibration on Lavie N: After fitting this cell, run one full discharge down to hibernate cutoff, 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 Lavie N hardware.
BIOS reporting poor battery health immediately after fitting this cell
The Lavie N BIOS reads health status from EEPROM data stored inside the battery pack, not from live voltage alone. When a new cell is installed, the EEPROM cycle count and capacity history do not match the BIOS's learned profile from the old pack. This mismatch triggers a "poor health" or "replace battery" warning even on a fresh cell. One full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the BIOS to re-learn the new pack and clears the warning.
Lavie N shutting down without warning at 20–30% shown on the fuel gauge
This happens when the cell voltage drops below the BMS cutoff threshold under combined CPU and display load, even though the OS fuel gauge still shows charge remaining. The fuel gauge IC has not yet calibrated against the new cell's actual discharge curve, so it overestimates remaining capacity. The voltage cliff — where voltage drops sharply under load near depletion — hits the BMS cutoff before the gauge reaches zero. Run two or three full discharge-to-hibernate cycles to let the fuel gauge IC recalibrate; shutdowns should stop occurring above 10% after that.