Commax DR202 Laptop Replacement Battery 10.8V 6600mAh

Commax DR202 / ME202BB / NL2020 — 10.8V Li-ion Replacement Battery (DR202)

This is a 10.8V 6600mAh (71.28Wh) Li-ion battery for laptops using the Commax DR202 cell platform. OEM part numbers DR202, EMC36, ME202BB, NL2020, and SMP02 all cross to this unit — confirm your OEM number before ordering. Voltage and connector must match your existing battery exactly.

• Multi-part-number platform: The DR202, EMC36, ME202BB, NL2020, and SMP02 numbers refer to the same 10.8V cell configuration — same connector pinout, same BMS handshake voltage thresholds, and the same three-cell-series topology. Swapping between these part numbers does not change electrical compatibility.
• Bench tested on actual hardware: We ran charge and discharge cycles through the BMS to verify cell balancing, protection circuit cutoffs, and thermal sensor response. The BMS tripped correctly at both high-voltage and low-voltage limits, and charge acceptance was consistent across all six cells.
• Post-install calibration cycle: After fitting this battery, run the laptop down fully until it hibernates, then charge uninterrupted to 100% before using it again. This forces the BIOS battery learn cycle to reset against the new cell data and clears the inaccurate health warning that appears after a cell swap.

BIOS reporting battery health as poor immediately after installation

The BIOS reads health data from the battery's EEPROM — a small memory chip that stores cycle count, rated capacity, and manufacture date from the original cell. When a new battery arrives, the BIOS compares live readings against that stored data and flags a mismatch as poor health. This is not a fault with the new battery. Run one full discharge-to-hibernate cycle followed by a full uninterrupted charge to 100%, and the BIOS will rewrite its baseline against the new cell's EEPROM values.

Laptop shuts down abruptly at 20–30% charge shown on screen

This happens when the fuel gauge IC still holds calibration data from the old, degraded cell. Under full CPU and display load, the new cell's actual voltage drops faster than the fuel gauge expects, and the BMS trips the circuit before the OS can issue a low-battery warning. The displayed percentage is wrong — the IC is reading against a stale discharge curve. Run two complete discharge-to-hibernate and full-charge cycles to let the fuel gauge IC recalibrate against the new cell; the shutdown threshold should stabilise to the correct voltage of around 9.0V under load.