KDS 671 Replacement Battery 10.8V 6600mAh DR202

KDS 671 / 671DP / 671XH Series — 10.8V Li-ion Replacement Battery (DR202)

This is a 10.8V, 6600mAh (71.28Wh) lithium-ion battery for KDS 671, 671DP, 671XH, 681, and related notebook models. It replaces OEM part numbers DR202, EMC36, ME202BB, NL2020, and SMP02. Install it when the original cell no longer holds a charge or the laptop dies faster than expected under normal use.

• 671 series compatibility: The 671, 671DP, 671XH, and 681 share the same battery bay dimensions, connector pinout, and BMS handshake protocol — one cell fits the whole group without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge runs and confirmed the BMS communicates correctly with the system board — charge acceptance, cutoff thresholds, and protection circuits all responded as expected.
• First-cycle reset after install: 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.

Why the 671 reports poor battery health immediately after a cell swap

The BIOS reads capacity and health data from EEPROM registers carried over from the old cell. A new cell arrives with different stored values, so the BIOS flags it as degraded before a single charge cycle runs. This is not a fault with the replacement — it is a mismatch between what the firmware remembers and what the new chemistry reports. Running one full discharge-to-hibernate then a complete charge clears the stale EEPROM data and lets the system re-learn the cell's actual capacity.

Laptop shuts down at 20–30% charge shown on the gauge

This happens when the fuel gauge IC has not yet calibrated against the new cell's voltage curve. The IC maps an old voltage profile to percentage, so it reads 25% while the cell is already at its low-voltage cutoff. Under combined CPU and display load, the cell voltage drops sharply — the BMS cuts power before the gauge catches up. Two or three full discharge-to-100% charge cycles re-calibrate the IC. After calibration, the cutoff aligns with the gauge at or below 5%.