Medion MD42100 Replacement Battery 11.1V 6600mAh

Medion MD42100 / MD95062 Series — 11.1V Li-ion Replacement Battery (442677000001)

This 11.1V, 6600mAh (73.26Wh) Li-ion cell replaces the original battery in the Medion MD42100, MD95062, MD95135, MD95144, and related notebook models. It fits the OEM connector and BMS handshake without modification. Capacity figure is drawn from product data — not interpolated from third-party sources.

• MD42100 and MD95-series compatibility: These notebooks share the same 11.1V three-cell rail, identical connector pinout, and the same BMS communication protocol — which is why a single cell covers the full platform range. Swapping between these models does not require firmware changes or adapter cables.
• Bench tested on actual hardware: We ran this cell through full charge-discharge cycles on an MD-series chassis. The BMS accepted the cell without fault flags, charge termination triggered correctly at capacity, and protection cutoff engaged at the expected low-voltage threshold under load.
• First-cycle reset after install: After fitting this cell, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity curve and clears the inaccurate health warning that appears on first boot after any cell swap.

BIOS reporting battery health as poor immediately after swapping this cell in

The Medion BIOS stores cycle count and health data in the EEPROM on the outgoing cell. When a new cell arrives, that EEPROM data is blank or mismatched — the BIOS reads this as degraded health, not as a fresh battery. This is a firmware interpretation issue, not a fault with the replacement cell. Running one complete discharge-to-hibernate followed by a full uninterrupted charge gives the BIOS enough data to rebuild its health estimate. After two to three full cycles the health status typically resolves to normal.

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

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage-to-capacity curve. The displayed percentage is based on the old cell's profile, so the gauge reads 25% while the cell is already near its low-voltage cutoff. The notebook shuts down because the cell voltage drops below the BMS protection threshold before the displayed percentage reaches zero. Fix this by completing two to three full discharge-to-hibernate and full-charge cycles — after which the fuel gauge IC recalibrates and the displayed percentage tracks actual cell voltage accurately. Target a resting voltage of approximately 12.6V at full charge to confirm the cell is genuinely full.