Medion MD42703 Replacement Battery 14.8V 4400mAh

Medion MD42703 / MD42811 Series — 14.8V Ni-CD Replacement Battery (441684410001)

This is a 14.8V, 4400mAh Ni-CD replacement battery for the Medion MD42703, MD42811, MD95078, and MID2030 notebook computers. It slots into the original battery bay and connects via the stock latch mechanism. Capacity is rated at 65.12Wh, matching the original cell specification.

• MD42703 and MD42811 platform compatibility: These models share the same 14.8V battery rail, identical connector pinout, and the same BMS handshake protocol — one cell pack covers all of them without modification or adapter.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the MD42703 platform. The BMS accepted the new pack without fault codes, and the charge controller reached cutoff cleanly at 100% with no thermal event during the cycle.
• Ni-CD reconditioning cycle after install: Ni-CD cells develop memory effect if cycled shallowly. After installing, run the laptop on battery only until it reaches hibernate cutoff — do not interrupt — then charge uninterrupted to 100%. This clears residual memory from the old cell's charge pattern and resets the BIOS battery learn cycle.

BIOS reporting battery health as poor immediately after fitting the new cell

The Medion BIOS stores historical charge data in an EEPROM on the battery's BMS board. When a new cell goes in, the BIOS compares current readings against that stored data and flags a health warning because the figures don't match yet. This is not a fault with the replacement pack — it is a calibration gap. Run one full discharge-to-hibernate cycle followed by a full uninterrupted charge. The BIOS battery learn cycle updates the EEPROM against the new cell's actual readings and the health warning clears.

Laptop shuts down abruptly while the OS gauge still shows 20–30% remaining

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The IC estimates state-of-charge using data from the old degraded cell, so it reads 25% while the actual cell voltage has already dropped below the minimum cutoff threshold under CPU and display load. The fix is two to three full discharge-to-hibernate cycles with uninterrupted charges between each — the fuel gauge IC recalibrates its model on each pass. After the third cycle, check that the shutdown point has moved below 10% indicated charge and that resting cell voltage reads above 12.0V at that point.