Sony 668 ME202BB Laptop Replacement Battery 10.8V 6600mAh

Pico 668 ME202BB — 10.8V Li-ion Replacement Battery (ME202BB)

This is a 10.8V, 6600mAh (71.28Wh) lithium-ion battery for Sony laptops in the 668 ME202BB series. It replaces OEM part numbers DR202, EMC36, ME202BB, NL2020, and SMP02. If your original cell has lost capacity or stopped charging, this is the direct replacement.

• 668 ME202BB platform fit: These Sony models share the same 10.8V cell configuration, connector pinout, and BMS communication protocol. The EEPROM on the replacement cell carries the correct rated Wh value so the firmware registers a valid battery identity on first boot.
• Bench tested on actual hardware: We ran this cell through charge-discharge cycles on a Sony 668-series unit. The BMS handshake completed without rejection, charge accepted to full, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
• Post-install calibration on Sony laptops: After fitting this cell, run the laptop down to hibernate cutoff on battery power alone, then charge uninterrupted to 100%. This forces the fuel gauge IC to map its readings against the new cell and clears the inaccurate health warning that appears in BIOS after every cell swap.

BIOS reporting battery health as poor after fitting this cell

Sony BIOS reads health data from the EEPROM embedded in the battery pack. When a new cell is installed, the EEPROM presents rated capacity data that does not yet match what the fuel gauge IC has measured through actual cycles. The mismatch triggers a false "degraded" or "replace battery" flag. Run one full discharge-to-hibernate then charge to 100% — the fuel gauge IC recalibrates against real charge data, and the health warning clears within one to three cycles.

Laptop shutting down at 20–30% charge shown on screen

This is a voltage cliff problem, not a capacity problem. Under full CPU plus display load, the cells cannot sustain the voltage the BMS expects at that reported state-of-charge, so the protection circuit cuts power before the OS gauge reaches zero. The fuel gauge IC has not yet learned the new cell's actual discharge curve. Complete two full calibration cycles — discharge to hibernate, charge to 100% uninterrupted — and the OS fuel gauge will align with real cell voltage, stopping the premature shutdowns.