NEC Ready 440T Replacement Battery 10.8V 6600mAh DR202

NEC Ready 440T — 10.8V Li-ion Replacement Battery (DR202)

This is a 10.8V, 6600mAh lithium-ion battery for the NEC Ready 440T notebook. It replaces OEM part numbers DR202, EMC36, ME202BB, NL2020, and SMP02. If your original cell no longer holds a charge or the laptop won't run off AC disconnect, this is the direct swap.

• Ready 440T platform fit: The 440T uses a fixed 10.8V three-cell-series configuration with a proprietary connector and BMS handshake tied to the DR202 family. All five OEM part numbers above share that same voltage rail and connector pinout, so one cell covers the full production run of this model.
• Bench tested on actual hardware: We cycled this cell through a full discharge-to-cutoff and uninterrupted charge sequence. The BMS negotiated correctly at both the charge and discharge terminals — no false cutoff, no balancing error logged.
• Post-install calibration on the Ready 440T: After fitting, run one full discharge until the laptop hibernates, then charge uninterrupted to 100% without interruption. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this model.

Why the Ready 440T BIOS flags a new battery as poor health

The 440T stores historical charge data in EEPROM on the battery controller. When a new cell arrives, that EEPROM data doesn't match the old cell's learned profile, so the BIOS reads it as degraded. This is a data mismatch, not a cell fault. Running one full calibration cycle — full discharge to hibernate, then uninterrupted charge to 100% — rewrites the learn cycle data. After two to three cycles, the BIOS health indicator updates to reflect the actual cell condition.

Ready 440T shutting down at 20–30% charge shown on screen

This happens when the fuel gauge IC's calibration is still mapped to the old cell's discharge curve. Under combined CPU and display load, voltage drops faster than the gauge predicts, and the BMS trips the cutoff before the displayed percentage reaches zero. The fix is completing two to three full discharge-to-hibernate cycles so the fuel gauge IC re-maps against the new cell. After calibration, the shutdown point aligns with the actual remaining capacity — confirm the cell voltage reads above 9.0V at the 20% mark once calibrated.