About this replacement
Medion MD96442 / MD96559 / MD97900 Series — 10.8V Li-ion Replacement Battery (BTP-BGBM)
This is a 10.8V, 8800mAh (95.04Wh) Li-ion battery for Medion notebooks including the MD96442, MD96559, MD96570, and MD97900. It replaces OEM part numbers BTP-BGBM, BTP-BFBM, and 40018875. The connector and BMS handshake match the original Medion battery specification for these models.
- MD96442 / MD96559 / MD96570 / MD97900 compatibility: These notebooks share the same 10.8V battery platform, connector pinout, and BMS communication protocol — one cell fits all listed models without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an MD-series board. The BMS accepted the new cell, communicated state-of-charge data correctly, and charge termination triggered at the expected voltage ceiling.
- First-cycle calibration on Medion notebooks: After fitting this battery, run a full discharge until the laptop hibernates, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on Medion firmware.
BIOS reporting battery health as poor after fitting a new cell
Medion notebooks store battery health data in EEPROM on the old cell. When a new battery is fitted, the BIOS compares the fresh cell against stale EEPROM values and flags it as degraded — even though the cell is new. This is a firmware-side calibration gap, not a fault with the replacement battery. Run one full discharge-to-hibernate cycle followed by a full uninterrupted charge. After two to three cycles, the BIOS fuel gauge IC recalibrates against the actual cell capacity and the health warning clears.
Laptop shuts down at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet mapped the new cell's voltage curve — the percentage displayed does not match the actual remaining cell voltage. Under combined CPU and display load, the cell hits a voltage cliff that the OS did not anticipate, and the system shuts off to protect itself. It is not a fault with this battery. Run two full discharge-to-hibernate cycles with the laptop under normal use, then recharge fully each time — the fuel gauge will track the actual voltage curve accurately by the third cycle, and shutdowns at false percentages will stop.