Medion MD64300 Replacement Battery 14.4V 2200mAh

Medion MD64300 — 14.4V Li-ion Replacement Battery (6-87-NH50S-41C00)

This is a 14.4V, 2200mAh (31.68Wh) Li-ion replacement battery for the Medion MD64300 notebook. It fits the original battery bay and connects via the same OEM connector pinout. OEM part numbers 6-87-NH50S-41C00 and NH50BAT-4 both cross-reference this cell.

• MD64300 platform fit: The MD64300 uses a 4-cell Li-ion pack running a 14.4V nominal rail. This replacement matches that voltage rail and uses the same BMS communication protocol the laptop expects on the SMBus data lines.
• Bench tested on actual hardware: We cycled this cell through charge, full-load discharge, and BMS handshake verification. The protection circuit responded correctly to over-current and over-temperature events, and the pack reported state-of-charge data cleanly over SMBus.
• First-cycle calibration on the MD64300: After fitting, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100% without unplugging mid-cycle. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this notebook.

BIOS reporting poor battery health immediately after fitting a new cell

The MD64300 BIOS reads health data from the battery's EEPROM registers, which store charge-cycle history and rated capacity from the previous cell. A brand-new pack has fresh EEPROM values that don't match the laptop's learned discharge profile, so the BIOS flags it as degraded. This is not a fault with the replacement cell. Running one complete discharge-to-hibernate followed by a full uninterrupted charge lets the BIOS overwrite its stored profile against the new cell's actual behaviour. After one to two cycles the health indicator returns to normal.

MD64300 shutting down abruptly at 20–30% charge shown on screen

This happens when the cell voltage drops faster than the fuel gauge IC predicts under combined CPU and display load. The gauge was calibrated against an old, degraded cell, so its percentage readings don't map accurately to the new cell's voltage curve. The laptop hits the low-voltage hardware cutoff while the OS still shows 20–30% remaining. Fix it by completing two full calibration cycles — full discharge to hibernate-cutoff, then charge to 100% each time — so the fuel gauge IC relearns the voltage-to-capacity curve of the new cell. After calibration, shutdowns should not occur above 5–8% remaining.