NEC Versa N1100 Replacement Battery 11.1V 4400mAh Li-ion

NEC Versa N1100 / N1200 — 11.1V Li-ion Replacement Battery (PC-VP-BP60 / OP-570-76977)

This is an 11.1V 4400mAh (48.84Wh) Li-ion replacement battery for the NEC Versa N1100, Versa N1200, and VJW10A12 notebook computers. It slots into the same bay as the original PC-VP-BP60 / OP-570-76977 cell and connects through the same multi-pin BMS interface. Use it when the original cell no longer holds a charge or when BIOS flags the battery as failed.

• Versa N1100, N1200, and VJW10A12 compatibility: These three models share the same 11.1V cell architecture, connector pinout, and BMS communication protocol. One replacement battery covers all three without any wiring or adapter changes.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Versa platform and confirmed the BMS handshake completed without fault codes. The protection circuit responded correctly to overcharge and cutoff thresholds at expected voltages.
• Post-install calibration on the Versa N1100: After fitting the new cell, run a full discharge to the hibernate cutoff point, 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 the new cell

The Versa N1100 BIOS reads health data stored in the battery's EEPROM and compares it against the previous cell's discharge history. A brand-new cell has no accumulated cycle data, so the BIOS can flag it as degraded or unknown on the first boot. This is a firmware interpretation issue, not a hardware fault. Running one complete discharge-to-hibernate followed by a full uninterrupted charge gives the fuel gauge IC enough data to rewrite EEPROM and clear the warning.

Versa N1100 shutting down abruptly at 20–30% charge shown on screen

The OS fuel gauge reads state-of-charge from EEPROM data that was calibrated against the old, degraded cell. When the replacement cell's actual voltage drops under full CPU and display load, the system hits the hardware cutoff before the gauge reaches 0%. The fuel gauge IC needs two or three full discharge-and-charge cycles against the new cell to recalibrate its internal model. After those cycles the reported percentage and the actual cutoff point will align — target a resting voltage of 11.1V at full charge as your confirmation point.